Plants by Common Name
- Acibuche, Celtis reticulata
- Alamo Cottonwood, Populus fremontii
- Alamos Marigold, Tagetes lemmonii
- Abert Creeping Zinnia, Sanvitalia abertii
- Almond-leaf Willow, Salix amygdaloides
- Almond Willow, Salix amygdaloides
- Abert Buckwheat, Eriogonum abertianum
- Abert's Buckwheat, Eriogonum abertianum
- Abert's Creeping Zinnia, Sanvitalia abertii
- Abert's Sanvitalia, Sanvitalia abertii
- Abraham's Balm, Vitex agnus-castus
- Adonis Blazingstar, Mentzelia multiflora
- Adonis Blazing Star, Mentzelia multiflora
- Adonis Stickleaf, Mentzelia multiflora
- African Mustard, Brassica tournefortii
- African Sheepbush, Pentzia incana
- Aheahea, Chenopodiastrum murale
- Ajo Lily, Hesperocallis undulata
- Akulikuli-kula, Portulaca oleracea
- Alamos marigold, Tagetes lemmonii
- Alderleaf Cercocarpus, Cercocarpus montanus
- Alderleaf Cercocarpus, Cercocarpus montanus
- Alderleaf Mountain Mahogany, Cercocarpus montanus
- Alder-leaf Mountain-Mahogany, Cercocarpus montanus
- Alfalfa, Medicago sativa
- Algodone Sunflower, Helianthus niveus
- Alkalai Marsh Aster, Almutaster pauciflorus
- Alkali Goldenbush, Isocoma acradenia
- Alkali Heliotrope, Heliotropium curassavicum
- Alkali Jimmyweed, Isocoma acradenia
- Alkali Marsh Aster, Almutaster pauciflorus
- Alkali-marsh Aster, Almutaster pauciflorus
- Alkalimarsh Aster, Almutaster pauciflorus
- All-thorn Acacia, Vachellia constricta
- Alligator Juniper, Juniperus deppeana
- Alligatorweed, Alternanthera pungens
- Alpine Woodsorrel, Oxalis alpina
- Alpine False Springparsley, Cymopterus lemmonii
- Amberlily, Echeandia flavescens
- Ambrosia Bursage, Ambrosia ambrosioides
- Ambrosia Leaf Bur Ragweed, Ambrosia ambrosioides
- American Black Nightshade, Solanum americanum
- American Cow Parsnip, Heracleum maximum
- American Deervetch, Vicia americana
- American Dogweed, Verbesina encelioides
- American Dogwood, Cornus sericea
- American Dragonhead, Dracocephalum parviflorum
- American Trixis, Trixis california
- American Vetch, Vicia americana
- American Wild Carrot, Daucus pusillus
- Amole, Yucca elata
- Angel's Trumpet, Datura wrightii
- Annual Agoseris, Agoseris heterophylla
- Annual Bristle-weed, Xanthisma gracilis
- Annual Bristleweed, Xanthisma gracilis
- Annual Globemallow, Sphaeralcea coulteri
- Annual Horsetail, Laennecia coulteri
- Annual Lupine, Lupinus concinnus
- Annual Sowthistle, Sonchus oleraceus
- Annual Sunflower, Helianthus annuus
- Annual Goatsbeard, Agoseris heterophylla
- Annual Windmills, Allionia choisyi
- Anise, Cymopterus lemmonii
- Antelope Horns, Asclepias asperula
- Antelope Horns Milkweed, Asclepias asperula
- Antelopehorn Milkweed, Asclepias asperula
- Apache Beggarticks, Bidens aurea
- Apache Oak, Quercus emoryi
- Apacheplume, Fallugia paradoxa
- Apache Plume, Fallugia paradoxa
- Apache Snakeroot, Ageratina herbacea
- Apple of Sodom, Solanum americanum
- Apricot Globe-mallow, Sphaeralcea ambigua
- Apricot Mallow, Sphaeralcea ambigua
- Antelopehorn Milkweed, Asclepias asperula
- Arched Comb-bur, Pectocarya recurvata
- Arch-nutted Comb-bur, Pectocarya recurvata
- Arizona Ash, Fraxinus velutina
- Arizona Barrel Cactus, Ferocactus wislizeni
- Arizona Beggarticks, Bidens aurea
- Arizona Black Walnut, Juglans major
- Arizona Bluecurls, Trichostema arizonicum
- Arizona Blue-curls, Trichostema arizonicum
- Arizona Blue-eyes, Evolvulus arizonicus
- Arizona Centaury, Zeltnera arizonica
- Arizona Cottonrose, Logfia arizonica
- Arizona Cottonwood, Populus fremontii
- Arizona Cypress, Cupressus arizonica (= Hesperocyparis arizonica)
- Arizona Desert-thorn, Lycium exsertum
- Arizona Elderberry, Sambucus nigra ssp. cerulea
- Arizona Fishhook Cactus, Mammillaria grahamii
- Arizona Fluffweed, Logfia arizonica
- Arizona Foldwing, Dicliptera resupinata
- Arizona Grape, Vitis arizonica
- Arizona Honeysuckle, Lonicera arizonica
- Arizona Locoweed, Astragalus arizonicus
- Arizona Lupine, Lupinus arizonicus
- Arizona Milkvetch, Astragalus arizonicus
- Arizona Milkweed, Asclepias angustifolia
- Arizona Passionflower, Passiflora arizonica
- Arizona Pencil Cholla, Cylindropuntia arbuscula
- Arizona Popcorn Flower, Plagiobothrys arizonicus
- Arizona Popcornflower, Plagiobothrys arizonicus
- Arizona Poppy, Kallstroemia grandiflora
- Arizona Rainbow Cactus, Echinocereus rigidissimus
- Arizona Sandmat, Chamaesyce arizonica
- Arizona Sycamore, Platanus wrightii
- Arizona Thistle, Cirsium arizonicum
- Arizona Walnut, Juglans major
- Aroma, Vachellia farnesiana
- Aroma Amarilla, Vachellia farnesiana
- Aromatic Sumac, Rhus trilobata var. trilobata
- Arrow Weed, Pluchea sericea
- Arrowleaf Mallow, Malvella sagittifolia
- Arrowweed, Pluchea sericea
- Art's Seedless Desert Willow, Chilopsis linearis
- Arugula, Eruca vesicaria ssp. sativa
- Ashen Milkvetch, Astragalus tephrodes
- Asian Mustard, Brassica tournefortii
- Aster, Machaeranthera tenacetifolia
- Australian Saltbush, Atriplex semibaccata
- Australian-Spinach, Chenopodiastrum murale
- Australian Sheepbush Pentzia incana
- Autumn Sage, Salvia greggii
- Babosilla, Modiola caroliniana
- Baby Bonnets, Coursetia glandulosa
- Badlands Mule-ears, Scabrethia scabra
- Badlands Mulesears, Scabrethia scabra
- Badlands Wyethia, Scabrethia scabra
- Baja California Senna, Senna purpusii
- Baja Elephant Tree, Pachycormus discolor
- Baja Fairy Duster, Calliandra californica
- Baja Pencil Cholla, Cylindropuntia tesajo
- Ball Clover, Gomphrena sonorae
- Ball Clover, Gomphrena nitida
- Banana Yucca, Yucca baccata
- Barbados Fencepost, Caesalpinia pulcherrima
- Barestem Larkspur, Delphinium scaposum
- Bare-stem Larkspur, Delphinium scaposum
- Barnaby Thistle, Centaurea solstitialis
- Barrier Saltbush, Enchylaena tomentosa
- Basketbush, Rhus trilobata var. trilobata
- Bastard Toadflax, Comandra umbellata
- Bastardsage, Eriogonum wrightii
- Beaked Yucca, Yucca rostrata
- Bear Grass, Nolina microcarpa
- Beard Tongue, Penstemon barbatus
- Bearded Cat's-Eye, Cryptantha barbigera
- Bearded Catseye, Cryptantha barbigera
- Bearded Cryptantha, Cryptantha barbigera
- Beard-lip Beardtongue, Penstemon barbatus
- Beard-lip Penstemon, Penstemon barbatus
- Beardlip Penstemon, Penstemon barbatus
- Beargrass, Sacahuista, Nolina microcarpa
- Beaver Tail Cactus, Opuntia basilaris
- Beavertail Prickleypear, Opuntia basilaris
- Beavertail Pricklypear, Opuntia basilaris
- Bebbia, Bebbia juncea
- Bedstraw, Galium aparine
- Bedstraw, Galium stellatum
- Bedstraw Milkweed, Asclepias subverticillata
- Beebalm, Monarda citriodora
- Beetle Spurge, Euphorbia eriantha
- Bellota, Quercus emoryi
- Beloperone, Justicia californica
- Berry Saltbush, Atriplex semibaccata
- Betony, Stachys coccinea
- Bigbract Verbena, Verbena bracteata
- Big Bend Yucca, Yucca rostrata
- Big Bursage, Ambrosia ambrosioides
- Big Saltbush, Atriplex lentiformis
- Big Taper, Verbascum thapsus
- Bigelow Beargrass, Nolina bigelovii
- Bigelow Beggarticks, Bidens bigelovii
- Bigelow Desert Trumpet, Linanthus bigelovii
- Bigelow Nolina, Nolina bigelovii
- Bigelow's Beargrass, Nolina bigelovii
- Bigelow's Beggarticks, Bidens bigelovii
- Bigelow's Bristlehead, Carphochaete bigelovii
- Bigelow’s Bush, Carphochaete bigelovii
- Bigelow's Crossosoma, Crossosoma bigelovii
- Bigelow's Deserttrumpets, Linanthus bigelovii
- Bigelow's Linanthus, Linanthus bigelovii
- Bigelow's Nolina, Nolina bigelovii
- Bigroot Prickly Pear, Opuntia macrorhiza
- Bigpod Sesbania, Sesbania herbacea
- Big-pod Sesbania, Sesbania herbacea
- Big-podded Sesbania, Sesbania herbacea
- Bigroot, Marah gilensis
- Bigseed Alfalfa Dodder, Cuscuta indecora
- Bigseed Dodder, Cuscuta indecora
- Birchleaf Mountainmahogany, Cercocarpus montanus
- Bird of Paradise, Caesalpinia gilliesii
- Bird of Paradise Bush, Caesalpinia gilliesii
- Bird-of-Paradise Shrub, Caesalpinia gilliesii
- Birdcage Eveningprimrose, Oenothera deltoides
- Birdcage Evening-primrose, Oenothera deltoides
- Birdfoot Deervetch, Lotus corniculatus
- Bird's Foot Trefoil, Lotus corniculatus
- Birdsfoot Trefoil, Lotus corniculatus
- Birthwort, Aristolochia watsonii
- Black Oak, Quercus emoryi
- Black Pigweed, Trianthema portulacastrum
- Black Raspberry, Rubus leucodermis
- Blackcap Raspberry, Rubus leucodermis
- Blackcap, Rubus leucodermis
- Blackfoot Daisy, Melampodium leucanthum
- Blackjack Oak, Quercus emoryi
- Bladder Sage, Scutellaria (Salazaria) mexicana
- Bladderbush, Cleome isomeris
- Bladderpod, Burro-fat, Cleome isomeris
- Bladderpod, Physaria gordonii
- Bladderpod Sida, Rhynchosida physocalyx
- Bladderpod Spiderflower, Cleome isomeris
- Bladdersage, Scutellaria (Salazaria) mexicana
- Bladder-stem, Eriogonum inflatum
- Blanket Flower, Gaillardia pinnatifid
- Blanketflower, Gaillardia pinnatifid
- Blessed Milkthistle, Silybum marianum
- Blessed Milk-thistle, Silybum marianum
- Blite, Amaranthus fimbriatus
- Bloodberry Barberry, Berberis haematocarpa
- Bloodflower, Asclepias curassavica
- Bloodflower Milkweed, Asclepias curassavica
- Blood Weed, Plagiobothrys arizonicus
- Bloodweed, Plagiobothrys arizonicus
- Blood-weed, Plagiobothrys arizonicus
- Bloodwort, Achillea millefolium
- Bloomfell, Lotus corniculatus
- Blowball, Taraxacum officinale
- Blue Dick, Dichelostemma capitatum
- Blue Dicks, Dichelostemma capitatum
- Blue Elderberry, Sambucus nigra ssp. cerulea
- Blue Fiestaflower, Pholistoma auritum
- Blue Flax, Linum lewisii
- Blue Fiesta-flower, Pholistoma auritum
- Blue Palo Verde, Parkinsonia florida
- Blue Paloverde, Parkinsonia florida
- Blue Snapdragon Vine, Maurandella antirrhiniflora
- Blue Water Speedwell, Veronica anagallis-aquatica
- Blue Yucca, Yucca baccata
- Blue Yucca, Yucca rigida
- Bluedick, Dichelostemma capitatum
- Bluedicks, Dichelostemma capitatum
- Bluestem Pricklepoppy, Argemone pleiacantha
- Bottle Stopper, Eriogonum inflatum
- Bowlesia, Bowlesia incana
- Boxthorn, Lycium exsertum
- Boxthorn, Lycium fremontii
- Boxthorn, Lycium macrodon
- Bracted Vervain, Verbena bracteata
- Branched Noseburn, Tragia nepetifolia
- Branching Fleabane, Erigeron divergens
- Brickell-bush, Brickellia californica
- Bristlelobe Cryptantha, Johnstonella (=Cryptantha) angustifolia
- Bristle-lobed Sandmat, Chamaesyce setiloba
- Bristly Desertstar, Monoptilon bellioides
- Bristly Nama, Nama hispidum
- Brittlebush, Encelia farinosa
- Brittle Spineflower, Chorizanthe brevicornu
- Broadleaf Gilia, Aliciella latifolia
- Broadleaf Plantain, Plantago major
- Broad-leaf Gily-flower, Aliciella latifolia
- Broad-leaved Gilia, Aliciella latifolia
- Broom Baccharis, Baccharis sarothroides
- Broom Menodora, Menodora scabra
- Broom Snakeweed, Gutierrezia sarothrae
- Broom Twinberry, Menodora scabra
- Broomsnakeweed, Gutierrezia sarothrae
- Broomweed, Gutierrezia microcephala
- Broomweed, Gutierrezia sarothrae
- Brownspine Prickly Pear Cactus, Opuntia phaeacantha
- Brownspine Pricklypear, Opuntia phaeacantha
- Brown-spined Prickly Pear, Opuntia phaeacantha
- Booth Evening Primrose, Eremothera boothii
- Booth's Evening-primrose, Eremothera boothii
- Booth's Suncup, Eremothera boothii
- Brown-eyed Primrose, Chylismia claviformis
- Browneyes, Chylismia claviformis
- Brownfoot, Acourtia wrightii
- Brownspine Prickly Pear Cactus, Opuntia phaeacantha
- Brownspine Pricklypear, Opuntia phaeacantha
- Brown-Plume Wire-Lettuce, Stephanomeria pauciflora
- Brown-spined Prickly Pear, Opuntia phaeacantha
- Broom Snakeweed, Gutierrezia sarothrae
- Broomsnakeweed, Gutierrezia sarothrae
- Broomweed, Gutierrezia microcephala
- Broomweed, Gutierrezia sarothrae
- Buckbrush, Anisacanthus thurberi
- Buck-brush, Ceanothus fendleri
- Buckhorn Cholla, Cylindropuntia acanthocarpa
- Buckhorn Plantain, Plantago major
- Buckthorn, Frangula californica
- Buff Petal Rhynchosida physocalyx
- Buffalobur Nightshade, Solanum rostratum
- Buffpetal, Rhynchosida physocalyx
- Buffalobur, Solanum rostratum
- Bugseed, Dicoria canescens
- Bull Balls, Menodora scabra
- Bull Filaree, Erodium texanum
- Bull Nettle, Solanum elaeagnifolium
- Bullhead, Tribulus terrestris
- Bundleflower, Desmanthus cooleyi
- Burrobush, Ambrosia deltoidea
- Burrobush, Ambrosia dumosa
- Burrobush, Ambrosia monogyra
- Burrobush, Ambrosia salsola
- Burrobrush, Ambrosia monogyra
- Burrobrush, Ambrosia salsola
- Bur Parsley, Anthriscus caucalis
- Bur-clover, Medicago polymorpha
- Burr-chervil, Anthriscus caucalis
- Burr Chervil, Anthriscus caucalis
- Burr Medic, Medicago polymorpha
- Burro Weed, Ambrosia dumosa
- Burroweed, Isocoma tenuisecta
- Burrobrush, Ambrosia monogyra
- Burrobush, Ambrosia dumosa
- Burrobush, Ambrosia monogyra
- Burro-fat, Cleome isomeris
- Burro-weed, Ambrosia deltoidea
- Burrow Goldenweed, Isocoma tenuisecta
- Bursage, Ambrosia deltoidea
- Bur Sage, Ambrosia deltoidea
- Bush Encelia, Encelia frutescens
- Bush Mallow, Malacothamnus fasciculatus
- Bush Marigold, Tagetes lemmonii
- Bush Penstemon, Keckiella antirrhinoides
- Bush Penstemon, Penstemon ambiguus
- Bushy Honeysuckle, Lonicera albiflora
- Bushy Tick Clover, Desmodium batocaulon
- Butter and Eggs, Linaria vulgaris
- Butter-and-eggs, Linaria vulgaris
- Butterandeggs, Linaria vulgaris
- Buttercups, Oenothera speciosa
- Butter Daisy, Verbesina encelioides
- Butterfly Pea Vine, Callaeum macropterum
- Button Brittlebush, Encelia frutescens
- Buttonbush, Cephalanthus occidentalis
- Button-bush, Cephalanthus occidentalis
- Buttonweed, Malva neglecta
- Cactus Apple, Opuntia engelmannii
- Calanca, Chrysactinia mexicana
- Caliche Globemallow, Sphaeralcea coccinea
- Calico Cactus, Echinocereus engelmannii
- California Barrel Cactus, Ferocactus cylindraceus
- California Barrelcactus, Ferocactus cylindraceus
- California Bluebell, Phacelia campanularia
- California Brickellia, Brickellia californica
- California Brickellbush, Brickellia californica
- California Buckthorn, Frangula californica
- California Buckwheat, Eriogonum fasciculatum
- California Burclover, Medicago polymorpha
- California Chicory Rafinesquia californica
- California Colubrina, Colubrina californica
- California Creamcups, Platystemon californicus
- California Coffeeberry, Frangula californica
- California Juniper, Juniperus californica
- California Evening Primrose, Eulobus californicus
- California Evening Primrose, Oenothera californica
- California Eveningprimrose, Eulobus californicus
- California Eveningprimrose, Oenothera californica
- California Evening-primrose Oenothera californica
- California Fagonbush, Fagonia laevis
- California Fagonia, Fagonia laevis
- California Filaree, Erodium cicutarium
- California Fire Barrel Cactus, Ferocactus cylindraceus
- California Flannel Bush, Fremontodendron californicum
- California Flannelbush, Fremontodendron californicum
- California Fremontia, Fremontodendron californicum
- California Fuchsia, Epilobium canum
- California Goldenpoppy, Eschscholzia californica
- California Goldfields, Lasthenia californica
- California Mustard, Caulanthus lasiophyllus
- California Plumseed, Rafinesquia californica
- California Poppy, Eschscholzia californica
- California Primrose, Eulobus californicus
- California Snakebush, Colubrina californica
- California Suncup, Eulobus californicus
- California Trixis, Trixis california
- Calliopsis, Coreopsis tinctoria
- Caltrop, Goathead, Tribulus terrestris
- Camphorweed, Heterotheca subaxillaris
- Canada Cockleburr, Xanthium strumarium
- Canada Horseweed, Conyza canadensis
- Canadian Horseweed, Conyza canadensis
- Candle Cholla, Cylindropuntia kleiniae
- Candlewood, Fouquieria splendens
- Candy Barrel Cactus, Ferocactus wislizeni
- Cane Cholla, Cylindropuntia spinosior
- Cane Milkweed, Asclepias subulata
- Canotia, Canotia holacantha
- Canyon Beardtongue, Penstemon pseudospectabilis
- Canyon Morningglory, Ipomoea barbatisepala
- Canyon Morning-glory, Ipomoea barbatisepala
- Canyon Penstemon, Penstemon pseudospectabilis
- Canyon Ragweed, Ambrosia ambrosioides
- Cardus Marianus, Silybum marianum
- Careless Weed, Amaranthus palmeri
- Carelessweed, Amaranthus palmeri
- Carneros Yucca, Yucca faxoniana
- Carolina Bristlemallow, Modiola caroliniana
- Carolina Modiola, Modiola caroliniana
- Carolina Geranium, Geranium carolinianum
- Carolina Cranesbill, Geranium carolinianum
- Carpenter's Weed, Achillea millefolium
- Carpet Vervain, Verbena bracteata
- Carrizo Mountain Sandmat, Chamaesyce pediculifera
- Castorbean, Ricinus communis
- Castor Bean, Ricinus communis
- Castor-Bean, Ricinus communis
- Cat Claw Mimosa, Mimosa aculeaticarpa biuncifera
- Cat’s Claw, Mimosa roemeriana
- Catalpa Willow, Chilopsis lineari
- Catchweed Bedstraw, Galium aparine
- Catclaw, Mimosa roemeriana
- Catclaw Acacia, Acacia greggii
- Catclaw Mimosa, Mimosa aculeaticarpa biuncifera
- Catclaw, Acacia greggii
- Cat's Clover, Lotus corniculatus
- Caterpillarweed, Phacelia crenulata
- Caterpillar Phacelia, Phacelia distans
- Caterpillar Weed, Phacelia crenulata
- Caterpillar Weed, Phacelia distan
- Cattail, Typha domingensis
- Canyon Grape, Vitis arizonica
- Ceanothus Deerbrush, Ceanothus integerrimus
- Cedro, Cupressus arizonica
- Century Plant, Agave parryi
- Cenzio, Atriplex canescens
- Chamiso, Atriplex canescens
- Chaparral, Celtis pallida
- Chaparral Asphead, Aspicarpa hirtella
- Chaparral Bush-beardtongue, Keckiella antirrhinoides
- Chaparral Honeysuckle, Lonicera interrupta
- Chaparral Mallow, Malacothamnus fasciculatus
- Chaparral Nightshade, Solanum xanti
- Chaparral Sand-verbena, Abronia villosa
- Chaste Tree, Vitex agnus-castus
- Chasteberry, Vitex agnus-castus
- Checkerbark Juniper, Juniperus deppeana
- Cheesebush, Ambrosia salsola
- Cheeseplant, Malva neglecta
- Cheeseweed, Malva neglecta
- Cheeseweed Burrobrush, Ambrosia monogyra
- Cheeseweed Mallow, Malva parviflora
- Cherrystone Juniper, Juniperus monosperma
- Cherry Sage, Salvia greggii
- Chia, Salvia columbariae
- Chia Sage, Salvia columbariae
- Chihuahuan Brickellbush, Brickellia floribunda
- Chilicote, Erythrina flabelliformis
- Chillweed, Baccharis pteronioides
- China Lettuce, Lactuca serriola
- China Tamarisk, Tamarix chinensis
- Chinchweed, Pectis papposa
- Chinese Lantern, Quincula lobata
- Chinese Saltcedar, Tamarix chinensis
- Chinese Tamarisk, Tamarix chinensis
- Chinese Thornapple, Datura quercifolia
- Chinese Thorn-apple, Datura quercifolia
- Chinese-lantern, Quincula lobata
- Chinese-pulsey (Parsley), Heliotropium curassavicum
- Chinchweed, Pectis papposa
- Chiricahua Mountain Sandmat, Chamaesyce florida
- Chisos Mountain False Indianmallow, Allowissadula holosericea
- Chisos Mtn. False Indian-mallow Allowissadula holosericea
- Chocolate Daisy, Berlandiera lyrata
- Chocolate Flower, Berlandiera lyrata
- Cholla, Cylindropuntia tesajo
- Christmas Cactus, Cylindropuntia leptocaulis
- Christmas Cholla, Cylindropuntia leptocaulis
- Chuckwalla’s Delight, Bebbia juncea
- Cinchweed, Pectis papposa
- Cinchweed Fetidmarigold, Pectis papposa
- Ciprés, Cupressus arizonica
- Clarkia, Clarkia purpurea
- Clammyweed, Polanisia dodecandra
- Claret-cup Cactus, Echinocereus coccineus
- Clavatefruit Suncup , Chylismia claviformis
- Cleftleaf Wildheliotrope, Phacelia crenulata
- Cleft-leaf Wild Heliotrope, Phacelia crenulata
- Clematis, Clematis drummondii
- Cliff Fendlerbush, Fendlera rupicola
- Cliffrose, Purshia stansburiana
- Cleavers, Galium aparine
- Cleaverwort, Galium aparine
- Climbing Milkweed Vine, Sarcostemma cynanchoides
- Climbing Snapdragon, Maurandella antirrhiniflora
- Coach Whip, Fouquieria splendens
- Coast Range Wild Cabbage, Caulanthus lasiophyllus
- Coast Wild Cabbage, Caulanthus lasiophyllus
- Coast Wallflower, Erysimum capitatum
- Coastal Quail Bush, Atriplex lentiformis
- Coastal Scrub Wattle, Vachellia farnesiana
- Cochise Beardtongue, Penstemon dasyphyllus
- Cocklebur, Xanthium strumarium
- Cockleburr, Xanthium strumarium
- Coffee Bean, Sesbania herbacea
- Coffee Berry, Simmondsia chinensis
- Coffee-berry, Frangula californica
- Coffeeweed, Sesbania herbacea
- Colewort, Eruca vesicaria ssp. sativa
- Colorado Bur, Solanum rostratum
- Colorado Four-O'clock, Mirabilis multiflora
- Colorado Narrowleaf Beardtongue, Penstemon linarioides
- Colorado River Hemp, Sesbania herbacea
- Colorado River-hemp, Sesbania herbacea
- Coltstail, Conyza canadensis
- Columbia Cutleaf, Hymenopappus filifolius
- Combbur, Pectocarya recurvata
- Comb-bur, Pectocarya recurvata
- Comb-like Evening-primrose, Oenothera coronopifolia
- Common Buttonbush, Cephalanthus occidentalis
- Common Chinchweed, Pectis papposa
- Common Cocklebur, Xanthium strumarium
- Common Cow Thistle, Sonchus oleraceus
- Common Cowparsnip, Heracleum maximum
- Common Dandelion Taraxacum officinale
- Common Fiddleneck, Amsinckia menziesii var. intermedia
- Common Groundsel, Senecio vulgaris
- Common Henbit, Lamium amplexicaule
- Common Hoptree, Ptelea trifoliata
- Common Horehound, Marrubium vulgare
- Common Melilot, Melilotus indicus
- Common Melilot, Melilotus officinalis
- Common Mesquite, Prosopis juliflora var. torreyana
- Common Monkeyflower, Mimulus guttatus
- Common Mullein, Verbascum thapsus
- Common Pearleverlasting, Anaphalis margaritacea
- Common Pearly Everlasting, Anaphalis margaritacea
- Common Plantain, Plantago major
- Common Prickly Pear, Opuntia macrorhiza
- Common Purslane, Portulaca oleracea
- Common Russian Thistle, Salsola tragus
- Common Salsify, Tragopogon dubius
- Common Saltwort, Salsola tragus
- Common Silverbush, Ditaxis neomexicana
- Common Sotol, Dasylirion wheeleri
- Common Sow-thistle, Sonchus oleraceus
- Common Sowthistle, Sonchus oleraceus
- Common Sunflower, Helianthus annuus
- Common Toadflax, Linaria vulgaris
- Common Yarrow, Achillea millefolium
- Common Yellow Oxalis, Oxalis stricta
- Compact-headed Thistle, Carduus pycnocephalus
- Common Yellow Monkeyflower, Mimulus guttatus
- Compact-headed Thistle, Carduus pycnocephalus
- Compass Barrel Cactus, Ferocactus wislizeni
- Compass Plant, Lactuca serriola
- Confederate Vine, Antigonon leptopus
- Conyza, Laennecia coulteri
- Cooley's Bundleflower, Desmanthus cooleyi
- Cooper's Broomrape, Orobanche cooperi
- Cooper Frostmat, Achyronychia cooperi
- Cooper's Paperflower, Psilostrophe cooperi
- Copalquin, Pachycormus discolor
- Copper Canyon Daisy, Tagetes lemmonii
- Copper Mallow, Sphaeralcea coccinea
- Coral Vine, Antigonon leptopus
- Coralbean, Erythrina flabelliformis
- Coralito, Rivina humilis
- Cottonwood, Populus fremontii
- Coues' Cassia, Senna covesii
- Coues' Senna, Senna covesii
- Coulter Brickellbush, Brickellia coulteri
- Coulter Globe Mallow, Sphaeralcea coulteri
- Coulter Globemallow, Sphaeralcea coulteri
- Coulter's Horseweed, Laennecia coulteri
- Coulter Spiderling, Boerhavia coulteri
- Coulter's Brickellbush, Brickellia coulteri
- Coulter's Globemallow, Sphaeralcea coulteri
- Coulter's Matilija Poppy, Romneya coulteri
- Coulter's Spiderling, Boerhavia coulteri
- Coulter's Woolwort, Laennecia coulteri
- Coursetia, Coursetia glandulosa
- Coulter Hibiscus, Hibiscus coulteri
- Coulter's Lupine, Lupinus sparsiflorus
- Covena, Dichelostemma capitatum
- Coveria, Dichelostemma capitatum
- Cove Senna, Senna covesii
- Coves' Cassia, Senna covesii
- Cow Parsnip, Heracleum maximum
- Cowparsnip, Heracleum maximum
- Cowpen Daisy, Verbesina encelioides
- Cowboy's Fried Eggs, Argemone pleiacantha
- Cow's Tongue Prickly Pear, Opuntia engelmannii
- Coyote Tobacco, Nicotiana obtusifolia
- Coyote Willow, Salix exigua
- Crane's Bill, Geranium caespitosum
- Creamcups, Platystemon californicus
- Cream Cups, Platystemon californicus
- Creek Dogwood, Cornus sericea
- Creeping Barberry, Berberis repens
- Creeping Chaffweed, Alternanthera pungens
- Creeping Jenny, Convolvulus arvensis
- Creeping Oxalis, Oxalis corniculata
- Creeping Penstemon, Penstemon linarioides
- Creeping Saltbush, Atriplex semibaccata
- Creeping Woodsorrel, Oxalis corniculata
- Creeping Woods, Oxalis corniculata
- Creeping Waterprimrose, Ludwigia peploides
- Creeping Mahonia, Berberis repens
- Creosote Bush, Larrea tridentata
- Creosotebush, Larrea tridentata
- Creosote, Larrea tridentata
- Crested Anoda, Anoda cristata
- Crestrib Morningglory, Ipomoea costellata
- Crestrib Morning-glory, Ipomoea costellata
- Crete Weed, Hedypnois cretica
- Cretanweed, Hedypnois cretica
- Crow Poison, Nothoscordum bivalve
- Crownleaf Evening Primrose, Oenothera coronopifolia
- Crownleaf Eveningprimrose, Oenothera coronopifolia
- Crownleaf Evening-primrose, Oenothera coronopifolia
- Crowtoes, Lotus corniculatus
- Crimson Beak, Krameria bicolor
- Crucifixion Thorn, Canotia holacantha
- Crucifixion Thorn, Castela emoryi
- Curleycup Gumweed, Grindelia squarrosa
- Curlycup Gumweed, Grindelia squarrosa
- Curly-Cup Gumweed, Grindelia squarrosa
- Curlytop Gumweed, Grindelia squarrosa
- Curl-top Smartweed, Persicaria lapathifolia
- Curvenut Combseed, Pectocarya recurvata
- Cutleaf, Hymenopappus filifolius
- Cutleaf, Rudbeckia laciniata
- Cutleaf Coneflower, Rudbeckia laciniata
- Cutleaf Filaree, Erodium cicutarium
- Cutleaf Globemallow, Sphaeralcea rusbyi
- Cutleaf Goldenweed, Xanthisma spinulosum
- Cutleaf Ironplant, Xanthisma spinulosum
- Cut-leaf Blanketflower, Gaillardia pinnatifida
- Dahlberg daisy, Thymophylla pentachaeta
- Dainty Desert Hideseed, Eucrypta micrantha
- Daisy Desertstar, Monoptilon bellidiforme
- Dais, Senna covesii
- Damianita, Chrysactinia mexicana
- Damianita Daisy, Chrysactinia mexicana
- Dandelion, Taraxacum officinale
- Danglepod, Sesbania herbacea
- Daisy Desertstar, Monoptilon bellidiforme
- Datil, Yucca baccata
- Datil Yucca, Yucca baccata
- Day Flower, Commelina erecta
- Dayflower, Commelina erecta
- Dead Nettle, Lamium amplexicaule
- Deadnettle, Lamium amplexicaule
- Dead-man's Fingers, Cistanthe ambigua
- Dead-nettle, Lamium amplexicaule
- Deer Nut, Simmondsia chinensis
- Deer Vetch Lotus rigidus
- Deer-brier, Ceanothus fendleri
- Deerbrush Ceanothus, Ceanothus integerrimus
- Deerbrush, Ceanothus integerrimus
- Desert Acacia, Vachellia farnesiana
- Desert Anemone, Anemone tuberosa
- Desert Ash, Fraxinus velutina
- Desert Baileya, Baileya multiradiata
- Desert Bean, Phaseolus filiformis
- Desert Beardtongue, Penstemon pseudospectabilis
- Desert Bedstraw, Galium stellatum
- Desert Bells, Phacelia campanularia
- Desert Bird of Paradise, Caesalpinia gilliesii
- Desert Blazingstar, Mentzelia multiflora
- Desert Brickellbush, Brickellia floribunda
- Desert Broomrape, Orobanche cooperi
- Desert Broom, Baccharis sarothroides
- Desertbroom, Baccharis sarothroides
- Desert Canterbury Bells, Phacelia campanularia
- Desert Catalpa, Chilopsis linearis
- Desert Ceanothus, Ceanothus greggii
- Desert Chia, Golden Chia, Salvia columbariae
- Desert Chickory, Calycoseris wrightii
- Desert Chickory, Rafinesquia neomexicana
- Desert Chicory, Rafinesquia neomexicana
- Desert Christmas Cactus, Cylindropuntia leptocaulis
- Desert Cinchweed, Pectis papposa
- Desert Dandelion, Malacothrix glabrata
- Desert Datura, Datura discolor
- Desert Gold, Geraea canescens
- Desert Hideseed, Eucrypta micrantha
- Desert Larkspur, Delphinium scaposum
- Desert Elderberry, Sambucus nigra ssp. cerulea
- Desert Eriastrum, Eriastrum eremicum
- Desert Eucrypta, Eucrypta micrantha
- Desert Evening Primrose, Oenothera primiveris
- Desert Eveningprimrose, Oenothera primiveris
- Desert Evening-primrose, Oenothera primiveris
- Desert Fiestaflower, Pholistoma auritum
- Desert Fir, Peucephyllum schottii
- Desert Fivespot, Eremalche rotundifolia
- Desert Five-spot, Eremalche rotundifolia
- Desert Fleabane, Erigeron divergens
- Desert Four O'clock, Mirabilis multiflora
- Desert Globemallow, Sphaeralcea ambigua
- Desert Gold, Geraea canescens
- Desert Gold, Leptosiphon aureus
- Desert Gold Poppy, Eschscholzia glyptosperma
- Desert Goldenpoppy, Eschscholzia glyptosperma
- Desert Ground Cherry, Physalis crassifolia
- Desert Hackberry (Spiny), Celtis pallida
- Desert Hibiscus, Hibiscus coulteri
- Desert Holly, Acourtia nana
- Desert Holly, Atriplex hymenelytra
- Desert Honeysuckle, Anisacanthus thurberi
- Desert Horsepurslane, Trianthema portulacastrum
- Desert Hyacinth, Dichelostemma capitatum
- Desert Indianwheat, Plantago ovata
- Desert Ironwood, Olneya tesota
- Desert Lavender, Hyptis emoryi
- Desert Lily, Hesperocallis undulata
- Desert Limberbush, Jatropha cuneata
- Desert Linanthus, Linanthus demissus
- Desert Live Oak, Quercus emoryi
- Desert Mallow, Sphaeralcea ambigua
- Desert Milkweed, Asclepias subulata
- Desert Marigold, Baileya multiradiata
- Desertmarigold Baileya, Baileya pleniradiata
- Desert Mariposa, Calochortus kennedyi
- Desert Mariposa Lily, Calochortus kennedyi
- Desert Mustard, Brassica tournefortii
- Desert Needle, Palafoxia arida var. arida
- Desert Needles, Palafoxia arida
- Desert Palafox, Palafoxia arida
- Desert Palafox, Palafoxia arida var. arida
- Desert Palafox, Palafoxia arida var. gigantea
- Desert Palafoxia, Spanish Needles, Palafoxia arida
- Desert Pearl, Ambrosia salsola
- Desert Penstemon, Penstemon pseudospectabilis
- Desert Pincushion, Chaenactis stevioides
- Desert Poinsettia, Euphorbia eriantha
- Desert Poinsettia, Euphorbia heterophylla
- Desert Poppy, Eschscholzia glyptosperma
- Desert Poppy, Kallstroemia grandiflora
- Desert Pot-herb, Cistanthe ambigua
- Desert Prickly Pear, Opuntia phaeacantha
- Desert Pussypaws, Cistanthe ambigua
- Desert Rock Daisy, Perityle emoryi
- Desert Rock Pea, Lotus rigidus
- Desert Rockpurslane, Calandrinia ciliata
- Desert Rose Mallow, Hibiscus coulteri
- Desert Rosemallow, Hibiscus coulteri
- Desert Sand Verbena, Abronia villosa
- Desert Sandverbena, Abronia villosa
- Desert Sand-verbena, Abronia villosa
- Desert Scorpionweed Phacelia campanularia
- Desert Senna, Senna covesii
- Desert Spoon, Dasylirion wheeleri
- Desert Star, Monoptilon bellioides
- Desert Straw, Stephanomeria pauciflora
- Desert Sumac, Rhus microphylla
- Desert Sunflower, Geraea canescen
- Desert Thorn, Lycium fremontii
- Desert Trumpet, Eriogonum inflatum
- Desert Starvine, Brandegea bigelovii
- Desert Storksbill, Erodium texanum
- Desert Thistle, Cirsium neomexicanum
- Desert Thorn Apple, Datura discolor
- Desert Thorn-apple, Datura discolor
- Desert Tobacco, Nicotiana obtusifolia
- Desert Twinbugs, Dicoria canescens
- Desert Unicorn-plant, Proboscidea althaeifolia
- Desert Velvet, Psathyrotes ramosissima
- Desert White Cedar, Juniperus californica
- Desert Willow, Chilopsis linearis
- Desert Willow, Salix exigua
- Desert Windflower, Anemone tuberosa
- Desert Wishbone-bush, Mirabilis laevis
- Desert Wolfberry, Wolfberry, Lycium macrodon
- Desert Woolystar, Eriastrum eremicum
- Desert Woolstar, Eriastrum eremicum
- Desert Zinnia, Zinnia acerosa
- Desertbroom, Baccharis sarothroides
- Desertgold, Geraea canescens
- Desertholly, Atriplex hymenelytra
- Desertmarigold Baileya, Baileya pleniradiata
- Desertsnow, Linanthus demissus
- Desertstar, Monoptilon bellioides
- Desertwillow, Chilopsis linearis
- Desert-lily, Hesperocallis undulata
- Desert-trumpets, Leptosiphon aureus
- Devil's Guts, Convolvulus arvensis
- Devilsclaw, Devil's Claw, Proboscidea althaeifolia
- Devilshorn, Proboscidea althaeifolia
- Devil's Claw, Proboscidea parviflora
- Devil's Lettuce, Amsinckia menziesii var. intermedia
- Devil's Spineflower, Chorizanthe rigida
- Devil's Walking Stick, Fouquieria splendens
- Devil's Weed, Datura wrightii
- Devilsclaw, Acacia greggii
- Devilsclaw, Proboscidea parviflora
- Dicliptera, Dicliptera resupinata
- Diffuse Eriastrum, Eriastrum diffusum
- Diffuse Woolstar, Eriastrum diffusum
- Dillen's Oxalis, Oxalis stricta
- Distant Phacelia, Phacelia distans
- Distant Scorpion-weed Phacelia distans
- Dogbane Dyssodia, Dyssodia papposa
- Dogweed, Dyssodia papposa
- Dogweed, Thymophylla pentachaeta
- Dodder, Cuscuta indecora
- Doubleclaw, Proboscidea parviflora
- Doubting Mariposa Lily, Calochortus ambiguus
- Douglas’ Stitchwort, Minuartia douglasii
- Downy Dalea, Dalea mollissima
- Dragonhead, Dracocephalum parviflorum
- Dragonhead Mint, Dracocephalum parviflorum
- Dragon's Head Dracocephalum parviflorum
- Drummond's Clematis, Clematis drummondii
- Drummond Clematis, Clematis drummondii
- Duckweed, Portulaca oleracea
- Dudley Willow, Salix gooddingii
- Dune Cat's-Eye, Cryptantha ganderi
- Dune Croton, Croton wigginsii
- Dune Evening Primrose, Oenothera deltoides
- Dune Primrose, Oenothera deltoides
- Dune Spanish Needle, Palafoxia arida var. gigantea
- Dusky Onion, Allium campanulatum
- Dutchman's Breeches, Thamnosma montana
- Dwarf Desertpeony, Acourtia nana
- Dwarf False Pennyroyal, Hedeoma nana
- Dwarf Four O'clock, Mirabilis pumila
- Dwarf Mallow, Malva neglecta
- Dwarf Milkweed, Asclepias involucrata
- Dwarf Pennyroyal, Hedeoma nana
- Dwarf Poinciana, Caesalpinia pulcherrima
- Dwarf White Milkvetch, Astragalus didymocarpus
- Dyschoriste, Dyschoriste schiedeana var. decumbens
- Easter Daisy, Townsendia exscape
- Eaton Penstemon, Penstemon eatonii
- Eaton's Penstemon, Penstemon eatonii
- Eclipta, Eclipta prostrata
- Eastern Mojave Buckwheat, Eriogonum fasciculatum
- Egyptian Mallow, Malva parviflora
- Elegant Lupine, Lupinus concinnus
- Elephant Tree, Bursera microphylla
- Elephant Tree, Pachycormus discolor
- Ellington Curse, Vachellia farnesiana
- Emory Rock Daisy, Perityle emoryi
- Emory Rockdaisy, Perityle emoryi
- Emory's Crucifixion-thorn, Castela emoryi
- Emory's Rockdaisy, Perityle emoryi
- Emory's Rocklily, Perityle emoryi
- Encino, Quercus turbinella
- Engelmann Hedgehog, Echinocereus engelmannii
- Engelmann's Hedgehog Cactus, Echinocereus engelmannii
- Engelmann Prickly Pear, Opuntia engelmannii
- Engelmann Pricklypear, Opuntia engelmannii
- Entireleaf Morningglory, Ipomoea hederacea
- European Bindweed, Convolvulus arvensis
- Erect Dayflower, Commelina erecta
- Erect Woodsorrel, Oxalis stricta
- Ericameria, Ericameria laricifolia
- Esperanza, Tecoma stans
- Esteve’s Pincushion, Chaenactis stevioides
- Exserted Indian Paintbrush, Castilleja exserta
- Faceclock, Taraxacum officinale
- Facelia Phacelia tanacetifolia
- Fairy Duster, Calliandra eriophylla
- Fairyduster, Calliandra eriophylla
- Fairy-ring Agave, Agave toumeyana v bella
- False Boneset, Brickellia californica
- False Filaree, Erodium texanum
- False Daisy, Eclipta prostrata
- False Damiana, Chrysactinia mexicana
- False Dandelion, Agoseris glauca
- False Dragonhead, Dracocephalum parviflorum
- False Garlic, Nothoscordum bivalve
- False Mock-orange, Fendlera rupicola
- False Monkeyflower, Mimetanthe pilosa
- False Monkey-flower, Mimetanthe pilosa
- False Pennyroyal, Hedeoma nana
- False Springparsley, Cymopterus lemmonii
- False Willow, Chilopsis linearis
- Fat-hen, Chenopodium album
- Faxon Yucca, Yucca faxoniana
- Feather Dalea, Dalea formosa
- Feather Indigo, Dalea formosa
- Feather Plume, Dalea formosa
- Featherplume, Dalea formosa
- Feathery Dalea, Dalea formosa
- Fendler Bush, Fendlera rupicola
- Fendler Ceanothus, Ceanothus fendleri
- Fendler Globe Mallow, Sphaeralcea fendleri
- Fendler Horsenettle, Solanum fendleri
- Fendler Rose, Rosa woodsii
- Fendlera, Fendlera rupicola
- Fendlerbush, Fendlera rupicola
- Fendler’s Buckbrush, Ceanothus fendleri
- Fendler's Ceanothus, Ceanothus fendleri
- Fendler's Globemallow, Sphaeralcea fendleri
- Fendler's Horsenettle, Solanum fendleri
- Fern Acacia, Vachellia angustissima
- Fetid Dogweed, Dyssodia papposa
- Fetid Marigold, Dyssodia papposa
- Fetid Marigold, Thymophylla acerosa
- Fetid-marigold, Dyssodia papposa
- Fewflower Wirelettuce, Stephanomeria pauciflora
- Few-flower Beggarticks, Bidens leptocephala
- Fewflower Beggarticks, Bidens leptocephala
- Fiddleneck, Amsinckia menziesii var. intermedia
- Fiddleneck, Phacelia tanacetifolia
- Field Bindweed, Convolvulus arvensis
- Filaree, Redstem, Erodium cicutarium
- Fine-leaf Woollywhite, Hymenopappus filifolius
- Fineleaf Hymenopappus, Hymenopappus filifolius
- Firecracker Penstemon, Penstemon eatonii
- Firewheel, Gaillardia pulchella
- Fishhook Barrel Cactus, Ferocactus wislizeni
- Fishhook Barrel, Ferocactus wislizeni
- Fivebract Cinchweed, Pectis filipes
- Fiveneedle Fetid Marigold, Thymophylla pentachaeta
- Fiveneedle Pricklyleaf, Thymophylla pentachaeta
- Fivestamen Tamarisk, Tamarix chinensis
- Fivewing Spiderling, Boerhavia intermedia
- Five-bract Cinchweed, Pectis filipes
- Five-stamen Tamarisk, Tamarix chinensis
- Five-wing Spiderling, Boerhavia intermedia
- Flame Mariposa, Calochortus kennedyi
- Flannel Flower, Fremontodendron californicum
- Flannel Mullein, Verbascum thapsus
- Flannel Plant, Verbascum thapsus
- Flannelbush, Fremontodendron californicum
- Flatcrown Buckwheat, Eriogonum fasciculatum
- Flattop Buckwheat, Eriogonum fasciculatum
- Flat-top Buckwheat, Eriogonum fasciculatum
- Flat-toped Buckwheat, Eriogonum deflexum
- Flat-topped Buckwheat, Eriogonum deflexum
- Flaxflowered Gilia, Ipomopsis longiflora
- Flaxflowered Ipomopsis, Ipomopsis longiflora
- Flaxweed, Linaria vulgaris
- Fleabane Daisy, Erigeron divergens
- Fleshcolor Pincushion, Chaenactis xantiana
- Fleshy Pincushion, Chaenactis xantiana
- Floating Primrose, Ludwigia peploides
- Floating Primrosewillow, Ludwigia peploides
- Floating Primrose-willow , Ludwigia peploides
- Florida Hopbush, Dodonaea viscosa
- Flowering Willow, Chilopsis linearis
- Fluffweed, Logfia arizonica
- Foothill Bird's-foot Trefoil, Lotus humistratus
- Foothill Palo Verde, Parkinsonia microphylla
- Foothill Deervetch, Lotus humistratus
- Foothills Goldenbanner, Thermopsis divaricarpa
- Forget-Me-Not, Johnstonella (=Cryptantha) angustifolia
- Foss Thistle, Cirsium neomexicanum
- Fourwing Saltbush, Atriplex canescens
- Four wing Saltbush, Atriplex canescens
- Four-wing Saltbush, Atriplex canescens
- Four-wing Salt Bush, Atriplex canescens
- Fragrant Evening Primrose, Oenothera caespitosa
- Fragrant Snakeroot, Ageratina herbacea
- Fragrant Sumac, Rhus trilobata var. trilobata
- Fremont Cottonwood, Populus fremontii
- Fremont Thornbush, Lycium fremontii
- Fremont Wolfberry, Lycium fremontii
- Fremont's Cottonwood, Populus fremontii
- Fremont's Desert-thorn, Lycium fremontii
- Fremont's Phacelia, Phacelia fremontii
- Fremont's Thornbush, Lycium fremontii
- Fremont's Geranium, Geranium caespitosum
- Fleshy-fruited Yucca, Yucca baccata
- Fringed Amaranth, Amaranthus fimbriatus
- Fringed Pigweed, Amaranthus fimbriatus
- Fringed Redmaids, Calandrinia ciliata
- Fringed Spurge, Chamaesyce setiloba
- Fringed Twinevine, Sarcostemma cynanchoides
- Frogfruit, Phyla nodiflora
- Frog Fruit, Phyla nodiflora
- Gambel Oak, Quercus gambelii
- Gambel's Oak, Quercus gambelii
- Gander's Buckhorn Cholla, Cylindropuntia ganderi
- Gander's Cryptantha, Cryptantha ganderi
- Garanona, Chrysactinia mexicana
- Garapatilla, Allionia choisyi
- Garden Birdsfoot Trefoil, Lotus corniculatus
- Garden Bird's-foot-trefoil Lotus corniculatus
- Garden Purslane, Portulaca oleracea
- Garden Rocket, Eruca vesicaria ssp. sativa
- Garden Tickseed, Coreopsis tinctoria
- Gaura, Oenothera suffrutescens
- Giant Cactus, Carnegiea gigantea
- Giant Dagger, Yucca faxoniana
- Giant Pigweed, Trianthema portulacastrum
- Giant Spanish Needle, Palafoxia arida var. gigantea
- Giant Trumpets, Macromeria viridiflora
- Gianttrumpets, Macromeria viridiflora
- Giant-trumpets, Macromeria viridiflora
- Gilia Beardtongue, Penstemon ambiguus
- Gila County Live-forever, Dudleya collomiae saxosa
- Gila Manroot, Marah gilensis
- Gilia Penstemon, Penstemon ambiguus
- Giraffehead, Lamium amplexicaule
- Girasol, Helianthus petiolaris
- Globe Chamomile, Oncosiphon piluliferum
- Globe mallow, Sphaeralcea ambigua
- Glossy Nightshade, Solanum americanum
- Goat Nut, Simmondsia chinensis
- Goathead, Tribulus terrestris
- Goat-heads, Tribulus terrestris
- Goat's Beard, Tragopogon dubius
- Goatsbeard, Tragopogon dubius
- Golden Aster, Heterotheca subaxillaris
- Golden Chia, Salvia columbariae
- Golden Columbine, Aquilegia chrysantha
- Golden Coreopsis, Coreopsis tinctoria
- Golden Crownbeard, Verbesina encelioides
- Golden Desert Snapdragon, Mohavea breviflora
- Golden Desert-snapdragon, Mohavea breviflora
- Golden Deserttrumpets, Leptosiphon aureus
- Golden Desert-trumpets, Leptosiphon aureus
- Golden Dyssodia, Thymophylla pentachaeta
- Golden Flowered Agave, Agave chrysantha
- Golden Linanthus, Leptosiphon aureus
- Golden Starthistle, Centaurea solstitialis
- Golden Suncup, Chylismia brevipes
- Golden Tickseed, Coreopsis tinctoria
- Goldenbeard Beardtongue, Penstemon barbatus
- Goldenbeard Penstemon, Penstemon barbatus
- Goldencarpet, Gilmania luteola
- Goldenflower Century Plant, Agave chrysantha
- Goldenglow, Rudbeckia laciniata
- Goldenhead, Acamptopappus sphaerocephalus
- Goldenhills, Encelia farinosa
- Goldenwave, Coreopsis tinctoria
- Golden-carpet Gilmania, Gilmania luteola
- Golden-flowered Agave, Agave chrysantha
- Golden-spined Barrel Cactus, Ferocactus cylindraceus
- Goldfields, Lasthenia californica
- Golondrina, Chamaesyce albomarginata
- Golondrina, Chamaesyce arizonica
- Golondrina, Chamaesyce capitellata
- Golondrina, Chamaesyce hyssopifolia
- Golondrina, Chamaesyce pediculifera
- Golondrina, Chamaesyce setiloba
- Goodding Willow, Salix gooddingii
- Goodding's Black Willow, Salix gooddingii
- Goodding's Willow, Salix gooddingii
- Gooding Black Willow, Salix gooddingii
- Goose Grass, Galium aparine
- Goosefoot, Chenopodium album
- Gordon Bladderpod, Physaria gordonii
- Gordon's Bladderpod, Physaria gordonii
- Graham Pincushion Cactus, Mammillaria grahamii
- Graham's Nipple Cactus, Mammillaria grahamii
- Graham's Thistle, Cirsium grahamii
- Granjeno, Celtis pallida
- Grassland Pricklypear, Opuntia macrorhiza
- Gravel-ghost, Atrichoseris platyphylla
- Grass-Leaf Sleepy Daisy, Xanthisma gracilie
- Grass-nuts, Dichelostemma capitatum
- Gray Amsonia, Amsonia tomentosa
- Gray Bindweed, Convolvulus equitans
- Gray Box Bush, Simmondsia chinensis
- Gray Oak, Quercus turbinella
- Graythorn, Ziziphus obtusifolia
- Gray-thorn, Ziziphus obtusifolia
- Greasewood, Baccharis sarothroides
- Great Mullein, Verbascum thapsus
- Great Plains Zinnia, Zinnia grandiflora
- Greater Alley Cat's-Eye, Cryptantha micrantha
- Greater Jacob's Ladder, Linaria vulgaris
- Green Brittlebush, Encelia frutescens
- Green Groundsel, Senecio flaccidus var. monoensis
- Green Tansymustard, Descurainia pinnata
- Green Thread, Thelesperma megapotamicum
- Green Threads, Thelesperma megapotamicum
- Greene Gila Manroot, Marah gilensis
- Green-flowered Milkweed, Asclepias asperula
- Green-flower Macromeria, Macromeria viridiflora
- Green-flowered Milkweed, Asclepias asperula
- Green-headed Coneflower, Rudbeckia laciniata
- Green-eyed Lyre Leaf, Berlandiera lyrata
- Greeneyes, Berlandiera lyrata
- Gregg Acacia, Acacia greggii
- Gregg Catclaw, Acacia greggii
- Gregg's Mistflower, Conoclinium greggii
- Gregg’s Sage, Salvia greggii
- Griffiths Saltbush, Atriplex torreyi var. griffithsii
- Griffiths' Saltbush, Atriplex torreyi var. griffithsii
- Groundcherry, Physalis pubescens
- Ground Cherry, Physalis acutifolia
- Ground Cherry, Physalis pubescens
- Ground Honeysuckle, Lotus corniculatus
- Groundsel, Baccharis sarothroides
- Gumbo Evening Primrose, Oenothera caespitosa
- Gumbo Lily, Oenothera caespitosa
- Gumdrop Tree, Ziziphus obtusifolia
- Gummy Broomweed, Xanthocephalum gymnospermoides
- Gummy Snakeweed, Xanthocephalum gymnospermoides
- Gumweed Grindelia squarrosa
- Gunnison Mariposa Lily, Calochortus gunnisonii
- Gunnison's Mariposa Lily, Calochortus gunnisonii
- Gurney's Hedgehog Cactus, Echinocereus coccineus
- Hackberry Beardtongue, Penstemon subulatus
- Hairy Bowlesia, Bowlesia incana
- Hairy Evolvulous, Evolvulus arizonicus
- Hairy Dalea, Dalea mollissima
- Hairy Deer Vetch, Lotus humistratus
- Hairy Desert Sunflower, Geraea canescens
- Hairy Desert Sun-flower, Geraea canescens
- Hairy Desert-Sunflower, Geraea canescens
- Hairy Desertsunflower, Geraea canescens
- Hairyleaf Wildcabbage, Caulanthus lasiophyllus
- Hairy-Leaved Calliandra, Calliandra eriophylla
- Hairy Rupturewort, Herniaria hirsuta
- Hare's Colwort, Sonchus oleraceus
- Hare's Thistle, Sonchus oleraceus
- Hardtack, Cercocarpus montanus
- Head Sandmat, Chamaesyce capitellata
- Heath-leaved Chaetopappa, Chaetopappa ericoides
- Heath Wrightwort, Carlowrightia linearifolia
- Hedgehog, Echinocereus bonkerae
- Hedgehog Cactus, Echinocereus bonkerae
- Hedgehog Cactus, Echinocereus engelmannii
- Heliotrope, Heliotropium curassavicum
- Heliotrope Phacelia, Phacelia crenulata
- Heller's Beardtongue, Penstemon triflorus
- Heller's Penstemon, Penstemon triflorus
- Hemp Sesbania, Sesbania herbacea
- Hemp Tree, Vitex agnus-castus
- Henbit, Lamium amplexicaule
- Herbaceous Joepieweed, Ageratina herbacea
- Heron Bill, Erodium cicutarium
- Heron Bill, Erodium texanum
- Hierba de Cancer, Acalypha neomexicana
- Hierba De Pasmo, Baccharis pteronioides
- Hierba de San Nicolas, Chrysactinia mexicana
- Hill Country Beardtongue, Penstemon triflorus
- Hill Country Penstemon, Penstemon triflorus
- Hill Locust and Maresfat, Lotus humistratus
- Hill Lupine, Lupinus hillii
- Hill's Lupine, Lupinus hillii
- Hillyhock Callaeum macropterum
- Hinds Nightshade, Solanum hindsianum
- Hinds' Nightshade, Solanum hindsianum
- Hinds' Willow, Salix exigua
- Hispid Nama, Nama hispidum
- Hoar False Tansy-Aster, Dieteria canescens
- Hoary Aster, Dieteria canescens
- Hoary Bindweed, Convolvulus equitans
- Hoary Bowlesia, Bowlesia incana
- Hoary Goldenweed, Dieteria canescens
- Hoary Machaeranthera, Dieteria canescens
- Hoary Saltbush, Atriplex canescens
- Hoary Tansy-aster, Dieteria canescens
- Hoary Tansyaster, Dieteria canescens
- Hog Potato, Hoffmannseggia glauca
- Holacantha, Castela emoryi
- Hollyleaf Buckthorn, Rhamnus crocea
- Holly-leaf Buckthorn, Rhamnus crocea
- Hollyleaf Buckthorn, Rhamnus ilicifolia
- Hollyleaf Redberry, Rhamnus ilicifolia
- Holly-leaf Buckthorn, Rhamnus ilicifolia
- Hollyleaf Bursage, Ambrosia eriocentra
- Holly Oak, Quercus emoryi
- Honey Mesquite, Prosopis juliflora var. torreyana
- Honeymat, Tidestromia lanuginosa
- Honeysuckle, Lonicera albiflora
- Honeysweet, Tidestromia lanuginosa
- Hooker's Evening Primrose, Oenothera elata
- Hooker's Eveningprimrose, Oenothera elata
- Hooker's Evening-primrose, Oenothera elata
- Hopbush, Dodonaea viscosa
- Hopi Blanketflower, Gaillardia pinnatifida
- Hopi Sunflower, Helianthus annuus
- Hopi Tea Greenthread, Thelesperma megapotamicum
- Hopitea Greenthread, Thelesperma megapotamicum
- Hopseed Bush, Dodonaea viscosa
- Hoptree, Ptelea trifoliata
- Horehound, Marrubium vulgare
- Horned Nightshade, Solanum rostratum
- Horse Bean, Parkinsonia aculeata
- Horse Purslane, Trianthema portulacastrum
- Horsemint, Monarda citriodora
- Horsetail Milkweed, Asclepias subverticillata
- Horseweed, Conyza canadensis
- Horseweed Fleabane, Conyza canadensis
- Huisache, Vachellia farnesiana
- Hummingbird Bush, Justicia californica
- Hummingbird Trumpet, Epilobium canum
- Hummingbird-trumpet, Epilobium canum
- Husk Tomato, Physalis pubescens
- Husk-tomato, Physalis pubescens
- Hyssopleaf Sandmat, Chamaesyce hyssopifolia
- Hyssop Spurge, Chamaesyce hyssopifolia
- 'Ihi, Oxalis corniculata
- Ill-scented Sumac, Rhus trilobata var. trilobata
- Imberis Woodyaster, Xylorhiza tortifolia
- Incienso, Encelia farinosa
- Indian-apple, Datura wrightii
- Indian Blanket, Gaillardia pulchella
- Indian Breadroot, Pediomelum mephiticum
- Indian Mallow, Abutilon palmeri
- Indian Paintbrush, Castilleja exserta
- Indian Pipeweed, Eriogonum inflatum
- Indian Root, Aristolochia watsonii
- Indian Rushpea, Hoffmannseggia glauca
- Indian Spice, Vitex agnus-castus
- Indian Sweet-clover, Melilotus indicus
- Indian Wheat, Plantago ovata
- Indian Blanket, Gaillardia pulchella
- Indianblanket, Gaillardia pulchella
- Indianblanket, Gaillardia pulchella
- Indian-bean, Erythrina flabelliformis
- Indian-lettuce, Claytonia parviflora
- Indigo Bush, Psorothamnus schottii
- Indigobush, Dalea formosa
- Indigobush, Psorothamnus spinosus
- Interior Rose, Rosa woodsii
- Ipomoea, Ipomoea ternifolia
- Ironplant, Xanthisma spinulosum
- Ironwood, Olneya tesota
- Italian Plumeless Thistle, Carduus pycnocephalus
- Italian Plumeless-Thistle, Carduus pycnocephalus
- Italian Thistle, Carduus pycnocephalus
- Ivyleaf Ground Cherry, Physalis hederifolia
- Ivyleaf Morningglory, Ipomoea hederacea
- Ivyleaf Morning-glory, Ipomoea hederacea
- Ivyleaf Groundcherry, Physalis hederifolia
- Ivy-leaf Morningglory, Ipomoea hederacea
- Jaeger's Joshua Tree, Yucca brevifolia
- James Bundleflower, Desmanthus cooleyi
- Japanese Poinsettia, Euphorbia heterophylla
- Jepson's Brickellbush, Brickellia californica
- Jerusalem Thorn, Parkinsonia aculeata
- Jerusalem-thorn, Parkinsonia aculeata
- Jimmyweed, Isocoma pluriflora
- Jimson Weed, Datura wrightii
- Jojoba, Simmondsia chinensis
- Jone's Boerhavia, Boerhavia intermedia
- Joshua Tree, Yucca brevifolia
- Jumping Cholla, Cylindropuntia bigelovii
- Juniper Mistletoe, Phoradendron juniperinum
- Kanab Thelypody, Thelypodiopsis ambigua
- Kandaroma, Vachellia farnesiana
- Kansas Thistle, Solanum rostratum
- Karoo Bush, Pentzia incana
- Kaweah River Phacelia, Phacelia magellanica
- Kaweah River Scorpion-weed, Phacelia magellanica
- Kearney Sumac, Rhus kearneyi
- Kearney's Sumac, Rhus kearneyi
- Khaki Weed, Alternanthera caracasana
- Khaki-Weed, Alternanthera pungens
- Khakiweed, Alternanthera pungens
- Kindlingweed, Gutierrezia sarothrae
- Kidneywood, Eysenhardtia orthocarpa
- Kingcup Cactus, Echinocereus coccineus
- Klein Cholla, Cylindropuntia kleiniae
- Klein's Pencil Cactus, Cylindropuntia kleiniae
- Klu, Klu Bush, Vachellia farnesiana
- Lamb’s-quarters, Chenopodium album
- Lambsquarters, Chenopodium album
- Lacepod, Thysanocarpus curvipes
- Lacepod Mustard, Thysanocarpus curvipes
- Lacy Phacelia, Phacelia tanacetifolia
- Lacy Scorpion-weed, Phacelia tanacetifolia
- Lacy Tansy-aster, Xanthisma spinulosum
- Lacy Tansyaster, Xanthisma spinulosum
- Laiteron, Sonchus oleraceus
- Lanceleaf Ditaxis, Ditaxis lanceolata
- Large Yellow Desert Primrose, Oenothera primiveris
- Largebract Spiderling, Boerhavia wrightii
- Large-bract Spiderling, Boerhavia wrightii
- Large-flowered Stork's Bill, Erodium texanum
- Larger Bur Marigold, Bidens laevis
- Largeseed Dodder, Cuscuta indecora
- Large-seed Dodder, Cuscuta indecora
- Largeseed Milkweed, Asclepias involucrata
- Las Animas Nakedwood, Colubrina californica
- Late Snakeweed, Gutierrezia serotina
- Lavender Thistle, Cirsium neomexicanum
- Leafy Nama, Nama demissum
- Leafy Spurge, Chamaesyce hyssopifolia
- Leap The Field, Salsola tragus
- Least Mallow, Malva parviflora
- Leatherleaf Ash, Fraxinus velutina
- Leatherplant, Jatropha cuneata
- Leatherweed, Croton pottsii
- Leatherweed Croton, Croton pottsii
- Lechuguilla, Agave lechuguilla
- Lemon Beebalm, Monarda citriodora
- Lemon Horsemint, Monarda citriodora
- Lemon Mint, Monarda citriodora
- Lemmon Groundsel, Senecio lemmonii
- Lemmon Marigold, Tagetes lemmonii
- Lemmon’s Marigold, Tagetes lemmonii
- Lemmon's Ragwort, Senecio lemmonii
- Lemon Sumac, Rhus trilobata var. trilobata
- Lens Bush, Atriplex lentiformis
- Lesser Wire-Lettuce, Stephanomeria tenuifolia
- Lesser Wirelettuce, Stephanomeria tenuifolia
- Lewis Flax, Linum lewisii
- Lewis Blue Flax, Linum lewisii
- Lewis' Flax, Linum lewisii
- Lilac Chaste Tree, Vitex agnus-castus
- Lilac Chastetree, Vitex agnus-castus
- Limberbush, Jatropha cuneata
- Lindley’s Silverpuffs, Microseris lindleyi
- Lipstick Plant, Plagiobothrys arizonicus
- Little Beardtongue, Penstemon subulatus
- Little Deserttrumpet, Eriogonum trichopes
- Little Desert Trumpet, Eriogonum trichopes
- Little Hogweed, Portulaca oleracea
- Little Leaf Bursera, Bursera microphylla
- Little Leaf Palo Verde, Parkinsonia microphylla
- Little Mallow, Malva parviflora
- Little Snapdragon Vine, Maurandella antirrhiniflora
- Littlehead Snakeweed, Gutierrezia microcephala
- Little-hogweed, Portulaca oleracea
- Little-leaf Cordia, Cordia parvifolia
- Littleleaf Sumac, Rhus microphylla
- Littleleaf Desert Sumac, Rhus microphylla
- Littleleaf Elephant Tree, Bursera microphylla
- Littleleaf Matelea, Matelea parvifolia
- Littleleaf Mulberry, Morus microphylla
- Littleleaf Palo Verde, Parkinsonia microphylla
- Littleleaf Ratany, Krameria erecta
- Littleleaf Rhatany, Krameria erecta
- Littleleaf Springbeauty, Claytonia parviflora
- Littleleaf Wolfberry, Lycium exsertum
- Lizard Tail, Oenothera curtiflora
- Lizard's Tail, Anemopsis californica
- Locoweed, Astragalus didymocarpus
- London Rocket, Sisymbrium irio
- Long Valley Tumblemustard, Thelypodiopsis ambigua
- Longleaf False Goldeneye, Heliomeris longifolia
- Longleaf Falsegoldeneyes, Heliomeris longifolia
- Longleaf Morning Glory, Ipomoea longifolia
- Long-flower Catclaw, Acacia greggii
- Long-flowered Gilia, Ipomopsis longiflora
- Long-flowered Skyrocket, Ipomopsis longiflora
- Long-pod Sesban, Sesbania herbacea
- Long-pod Sesbania, Sesbania herbacea
- Long-podded Sesban, Sesbania herbacea
- Long-spined Prickly Pear, Opuntia macrocentra
- Loomis' Thimblehead, Hymenothrix loomisii
- Lote Bush, Ziziphus obtusifolia
- Lote-bush Condalia, Ziziphus obtusifolia
- Lotebush, Ziziphus obtusifolia
- Louse Spurge, Chamaesyce pediculifera
- Low Rattlebox, Crotalaria pumila
- Lyreleaf Greeneyes, Berlandiera lyrata
- Lyre-leaf, Berlandiera lyrata
- Maguey Lechuguilla, Agave lechuguilla
- Maguire's Penstemon, Penstemon linarioides
- Mallow, Malva parviflora
- Malta Thistle, Centaurea melitensis
- Malta Starthistle, Centaurea melitensis
- Maltese Star Thistle, Centaurea melitensis
- Maltese Star-thistle, Centaurea melitensis
- Manele, Soapberry, Sapindus saponaria
- Manure Weed, Melde, Pigweed, Chenopodium album
- Manroot, Marah gilensis
- Manybristle Cinchweed, Pectis papposa
- Many-bristle Fetid-marigold, Pectis papposa
- Many-flower Gilia, Ipomopsis multiflora
- Manyflowered Four-O'clock, Mirabilis multiflora
- Manyflowered Gilia, Ipomopsis multiflora
- Manyflowered Ipomopsis, Ipomopsis multiflora
- Manyflowered Mentzelia, Mentzelia multiflora
- Many-flowered Desert Marigold, Baileya multiradiata
- Manzanita, Arctostaphylos pringlei
- Mares Tail, Conyza canadensis
- Maresfat, Lotus humistratus
- Marestail, Conyza canadensis
- Marian Thistle, Silybum marianum
- Mariola, Chrysactinia mexicana
- Mariposa, Calochortus ambiguus
- Mariposa, Calochortus gunnisonii
- Mariposa, Calochortus kennedyi
- Mariposa, Calochortus nuttallii
- Mariposa Lily, Calochortus kennedyi
- Marshmallow, Malva parviflora
- Marsh-Aster, Almutaster pauciflorus
- Marsh-fleabane, Pluchea sericea
- Mary Thistle, Silybum marianum
- Mat Amaranth, Amaranthus blitoides
- Mat Chaff-flower, Alternanthera caracasana
- Matchbrush, Gutierrezia sarothrae
- Matchweed, Gutierrezia microcephala
- Matchweed, Gutierrezia sarothrae
- Matchweed, Xanthocephalum gymnospermoides
- Matilija Poppy, Romneya coulteri
- Matraca, Peniocereus johnstonii
- Matweed Amaranth, Amaranthus blitoides
- Matweed, Amaranthus blitoides
- Matweed, Guilleminea densa
- Meadow Goat's-beard, Tragopogon dubius
- Mediterranean Milk Thistle, Silybum marianum
- Mediterranean Mustard/Turnip, Brassica tournefortii
- Melde, Chenopodium album
- Melon Leaf Nightshade, Solanum heterodoxum
- Melon-leaf Nightshade, Solanum heterodoxum
- Melonleaf Nightshade, Solanum heterodoxum
- Mendocino Bushmallow, Malacothamnus fasciculatus
- Mesa Dalea, Psorothamnus schottii
- Mesa Pepperwort, Lepidium alyssoides
- Mesa Tansy-aster, Machaeranthera tagetina
- Mesa Tansyaster, Machaeranthera tagetina
- Mescat Acacia, Vachellia constricta
- Mescat False Acacia, Vachellia constricta
- Mesquitella, Calliandra eriophylla
- Mexican Bird of Paradise, Caesalpinia gilliesii
- Mexican Bird-of-Paradise, Caesalpinia pulcherrima
- Mexican Bladdersage, Scutellaria (Salazaria) mexicana
- Mexican Bush Marigold, Tagetes lemmonii
- Mexican Butterfly Weed, Asclepias curassavica
- Mexican Coral Vine, Antigonon leptopus
- Mexican Creeper, Antigonon leptopus
- Mexican Crucillo, Condalia warnockii
- Mexican Elderberry, Sambucus nigra ssp. cerulea
- Mexican Evening Primrose, Oenothera speciosa
- Mexican-Fireplant, Euphorbia heterophylla
- Mexican Manzanita, Arctostaphylos pungens
- Mexican Milkweed, Asclepias curassavica
- Mexican Morningglory, Ipomoea hederacea
- Mexican Oregano, Lippia graveolens
- Mexican Palo Verde, Parkinsonia aculeata
- Mexican Paper Bag Bush Scutellaria (Salazaria) mexicana
- Mexican Passion Flower, Passiflora mexicana
- Mexican Passionflower, Passiflora mexicana
- Mexican Poinsettia, Euphorbia eriantha
- Mexican Poppy, Eschscholzia californica
- Mexican Poppy, Kallstroemia grandiflora
- Mexican Sandbur, Tribulus terrestris
- Mexican Skullcap, Scutellaria platyphylla
- Mexican Star, Milla biflora
- Mexican Thistle, Solanum rostratum
- Mexican Yellowshow, Amoreuxia palmatifida
- Matchweed, Gutierrezia microcephala
- Metcalf's Groundsel, Packera neomexicana
- Mexican Bush Marigold, Tagetes lemmonii
- Mexican Elder, Sambucus nigra ssp. cerulea
- Mexican Hat, Ratibida columnifera
- Mexican Thistle, Eryngium heterophyllum
- Mexican Yellowshow, Amoreuxia palmatifida
- Mexican-star, Milla biflora
- Miles' Milk-vetch, Astragalus didymocarpus
- Milfoil, Achillea millefolium
- Milk Thistle, Silybum marianum
- Milk Thistle, Sonchus oleraceus
- Milkweed, Asclepias angustifolia
- Milkweed, Asclepias asperula
- Milkweed, Asclepias subverticillata
- Milky Tassel, Sonchus oleraceus
- Miner's Lettuce, Bowlesia incana
- Miner's Lettuce, Claytonia perfoliata
- Miners Lettuce, Claytonia perfoliata
- Minerslettuce, Claytonia perfoliata
- Miniature Suncup, Camissonia micrantha
- Miniature Woollystar, Eriastrum diffusum
- Miniature Woolstar, Eriastrum diffusum
- Missouri Goldenrod, Solidago missouriensis
- Mistletoe, Phoradendron juniperinum
- Mock Goosefoot, Chenopodiastrum murale
- Mock Mesquite, Calliandra eriophylla
- Mock-pennyroyal, Hedeoma nana
- Modesto Ash, Fraxinus velutina
- Mohave Aster, Xylorhiza tortifolia
- Mohave Beardtongue, Penstemon pseudospectabilis
- Mohave Desertrue, Thamnosma montana
- Mohave Penstemon, Penstemon pseudospectabilis
- Mojave Aster, Xylorhiza tortifolia
- Mojave Buckwheat, Eriogonum fasciculatum
- Mojave Desertstar, Monoptilon bellidiforme
- Mojave Desertstar, Monoptilon bellioides
- Mojave Goldenbush, Ericameria linearifolia
- Mojave Lupine, Lupinus sparsiflorus
- Mojave Pincushion, Chaenactis xantiana
- Mojave Spurge, Euphorbia incisa
- Mojave Suncup, Chylismia brevipes
- Mojave Thistle, Cirsium mohavense
- Monkeyflower, Mimulus guttatus
- Monk's Pepper, Vitex agnus-castus
- Mono Ragwort, Senecio flaccidus var. monoensis
- Monolepis, Monolepis nuttalliana
- Morning Glory, Convolvulus arvensis
- Morning Glory, Ipomoea barbatisepala
- Morning Glory, Ipomoea hederacea
- Morningglory, Convolvulus arvensis
- Morning-glory, Ipomoea costellata
- Morning-glory,Ipomoea hederacea
- Moroccan Mustard, Brassica tournefortii
- Mountainmahogany, Cercocarpus montanus
- Mountain Cedar, Juniperus deppeana
- Mountain Dandelion, Agoseris heterophylla
- Mountain Walnut, Juglans major
- Mountain Laurel, Rhus ovata
- Mountain Marigold, Tagetes lemmonii
- Mountain Mulberry, Morus microphylla
- Mountain Parsley, Cymopterus lemmonii
- Mountain Rose, Rosa woodsii
- Mountain-rose Coralvine, Antigonon leptopus
- Mt. Lemmon Marigold, Tagetes lemmonii
- Mule-fat, Baccharis salicifolia
- Mule's Fat, Baccharis salicifolia
- Mullein, Verbascum thapsus
- Napa Thistle, Centaurea melitensis
- Narrow Leaved Stephanomeria, Stephanomeria tenuifolia
- Narrow Leaved Wire-Lettuce, Stephanomeria tenuifolia
- Narrowleaf Bean, Phaseolus angustissimus
- Narrowleaf Goldenbush, Ericameria linearifolia
- Narrowleaf Goldenweed, Ericameria linearifolia
- Narrowleaf Nievitas, Cryptantha barbigera
- Narrowleaf Pick-Me-Not, Johnstonella (=Cryptantha) angustifolia
- Narrowleaf Willow, Salix exigua
- Narrowleaf Silverbush, Ditaxis lanceolata
- Narrowleaf Wirelettuce, Stephanomeria tenuifolia
- Narrow-leaf Silverbush, Ditaxis lanceolata
- Narrow-leaf Willow, Salix exigua
- Narrow-leafed Mountain Balm, Eriodictyon angustifolium
- Narrow-Leaflet Bean, Phaseolus angustissimus
- Narrowleaf Yerba Santa, Eriodictyon angustifolium
- Narrowleaf Yerbasanta, Eriodictyon angustifolium
- Narrow-leafed Yerba Santa, Eriodictyon angustifolium
- Narrow-leaved Milkweed, Asclepias angustifolia
- Narrowstem Catseye, Cryptantha gracilis
- Narrow-Stem Cat's-Eye, Cryptantha gracilis
- Narrowstem Cryptantha, Cryptantha gracilis
- Narrowstem Pick-Me-Not, Cryptantha gracilis
- Native American Pipeweed, Eriogonum inflatum
- Needle Bush, Vachellia farnesiana
- Needle-Leaf Burrobush, Ambrosia monogyra
- Netleaf Hackberry, Celtis reticulata
- Netleaf Sugar Hackberry, Celtis reticulata
- Nettle-Leaf Goosefoot, Chenopodiastrum murale
- Nevada Biscuitroot, Lomatium nevadense
- Nevada Desert-parsley, Lomatium nevadense
- New Mexico Copperleaf, Acalypha neomexicana
- New Mexico Ditaxis, Ditaxis neomexicana
- New Mexican Elderberry, Sambucus nigra ssp. cerulea
- New Mexico Locust, Robinia neomexicana
- New Mexico Groundsel, Packera neomexicana
- New Mexico Honey Locust, Robinia neomexicana
- New Mexico Juniper, Juniperus monosperma
- New Mexico Plumeseed, Rafinesquia neomexicana
- New Mexico Prickly Pear, Opuntia phaeacantha
- New Mexico Ragwort, Packera neomexicana
- New Mexico Silverbush, Ditaxis neomexicana
- New Mexico Thistle, Cirsium neomexicanum
- New Mexico Walnut, Juglans major
- Nievitas, Cryptantha micrantha
- Nievitas, Cryptantha pterocarya
- Nievitas, Johnstonella (=Cryptantha) angustifolia
- Nipomo Mesa Annual Lupine Lupinus concinnus
- Nose-burn, Tragia nepetifolia
- Notchleaf Phacelia, Phacelia crenulata
- Notch-leafed Phacelia, Phacelia crenulata
- Notch-leaf Scorpion-weed, Phacelia crenulata
- Nuttall Monolepis, Monolepis nuttalliana
- Nuttall's Povertyweed, Monolepis nuttalliana
- Nuttall's Poverty Weed, Monolepis nuttalliana
- Nuttall's Poverty-weed, Monolepis nuttalliana
- Nuttall Snapdragon, Sairocarpus nuttallianus
- Oakbark Cedar, Juniperus deppeana
- Oak Creek Ragwort, Packera quercetorum
- Oak Leaved Angel's Trumpet, Datura quercifolia
- Oakleaf Datura, Datura quercifolia
- Oak-leaf Thorn-apple, Datura quercifolia
- Ocotillo, Fouquieria splendens
- Ocpatl, Vachellia angustissima
- Odora, Porophyllum gracile
- Old Man's Beard, Clematis drummondii
- Old-Man-in-the-Spring, Senecio vulgaris
- Oneseed Juniper, Juniperus monosperma
- One-seed Juniper, Juniperus monosperma
- Onyx Flower, Achyronychia cooperi
- Onyxflower, Achyronychia cooperi
- Orache, Atriplex lentiformis
- Orange Globemallow, Sphaeralcea coccinea
- Orange Caltrop, Kallstroemia grandiflora
- Orègano Cimmaron, Lippia graveolens
- Oregon Grape, Berberis repens
- Ortiguilla, Tragia nepetifolia
- Oxalis, Oxalis corniculata
- Pachaba, Brickellia californica
- Painted Euphorbia, Euphorbia heterophylla
- Painted Spurge, Euphorbia heterophylla
- Paiute False Bindweed, Calystegia longipes
- Pale Agoseris, Agoseris glauca
- Pale Mountain Dandelion, Agoseris glauca
- Pale Persicaria, Persicaria lapathifolia
- Pallid Suncup, Chylismia brevipes
- Palmer Amaranth, Amaranthus palmeri
- Palmer Indian Mallow, Abutilon palmeri
- Palmer Penstemon, Penstemon palmeri
- Palmer's Amaranth, Amaranthus palmeri
- Palmer's Grapplinghook, Harpagonella palmeri
- Palmer's Grappling-hook, Harpagonella palmeri
- Palmer's Indian Mallow, Abutilon palmeri
- Palmer's Penstemon, Penstemon palmeri
- Palmella, Yucca elata
- Palmilla, Yucca elata
- Palmita, Yucca rostrata
- Palm-leaf Mistflower, Conoclinium greggii
- Palm-leaf Thoroughwort, Conoclinium greggii
- Palo Blanco, Celtis reticulata
- Panamint Catseye, Johnstonella (=Cryptantha) angustifolia
- Panamint Cryptantha, Johnstonella (=Cryptantha) angustifolia
- Panamint Liveforever, Dudleya collomiae saxosa
- Panamint Narrow-Wing Cat's-Eye, Johnstonella (=Cryptantha) angustifolia
- Paper Daisy, Baileya multiradiata
- Paper Daisy, Psilostrophe cooperi
- Paper Flower, Psilostrophe cooperi
- Paper Bag Bush, Scutellaria (Salazaria) mexicana
- Paperflower, Psilostrophe cooperi
- Parachute Plant, Atrichoseris platyphylla
- Paradise Caesalpinia, Caesalpinia gilliesii
- Paradise Poinciana, Caesalpinia gilliesii
- Parashant Woodyaster, Xylorhiza tortifolia
- Parish's Biscuitroot, Lomatium navadense
- Parish’s Goldeneye, Bahiopsis parishii
- Parish's Monkeyflower, Mimulus guttatus
- Parry Agave, Agave parryi
- Parry's Agave, Agave parryi
- Parry's Beardtongue, Penstemon parryi
- Parry's Century-Plant, Agave parryi
- Parry's False Prairie-clover, Marina parryi
- Parry's Geranium, Geranium caespitosum
- Parry's Penstemon, Penstemon parryi
- Parry Dalea, Marina parryi
- Parry's Indigobush, Marina parryi
- Passion Flower, Passiflora arizonica
- Passion Flower, Passiflora mexicana
- Patata, Patota, Povertyweed, Monolepis nuttalliana
- Pavonia, Pavonia lasiopetala
- Pea Bush, Dalea formosa
- Peach-leaf Willow, Salix amygdaloides
- Peachleaf Willow, Salix amygdaloides
- Peach Willow, Salix amygdaloides
- Peacock Flower, Caesalpinia pulcherrima
- Pearhip Rose, Rosa woodsii
- Pearly Everlasting, Anaphalis margaritacea
- Pearly Globe Amaranth, Gomphrena nitida
- Peatree, Sesbania herbacea
- Pebble Pincushion, Chaenactis carphoclinia var. carphoclinia
- Peluda, Cryptantha barbigera
- Peluda, Cryptantha micrantha
- Peluda, Cryptantha pterocarya
- Peluda, Johnstonella (=Cryptantha) angustifolia
- Pencil Cholla, Cylindropuntia arbuscula
- Pencil Cholla, Cylindropuntia tesajo
- Perennial Marigold, Tagetes lemmonii
- Perennial Morningglory, Convolvulus arvensis
- Perennial Rockcress, Boechera perennans
- Perennial Snakeweed, Gutierrezia sarothrae
- Perennial Sowthistle, Sonchus asper
- Persian Knotweed, Polygonum argyrocoleon
- Peruvian Zinnia, Zinnia peruviana
- Physicnut, Jatropha cuneata
- Pickleleaf Dogweed, Thymophylla acerosa
- Pignut, Simmondsia chinensis
- Pigeon-berry, Frangula californica
- Pigeonberry, Rivina humilis
- Pignut, Hoffmannseggia glauca
- Pigweed, Chenopodiastrum murale
- Pigweed Amaranth, Amaranthus albus
- Pigweed, Amaranthus albus
- Pigweed, Amaranthus palmeri
- Pigweed, Amaranthus fimbriatus
- Pigweed, Chenopodium album
- Pima Rhatany, Krameria erecta
- Pin-Point Clover, Trifolium gracilentum
- Pincushion Flower, Chaenactis carphoclinia var. carphoclinia
- Pincushion Flower, Chaenactis stevioides
- Pine-leaf Milkweed, Asclepias linaria
- Pine-needle Milkweed, Asclepias linaria
- Pineneedle Milkweed, Asclepias linaria
- Pinkflower Hedgehog Cactus, Echinocereus bonkerae
- Pinkflower Hedgehog Cactus, Echinocereus faciculatus
- Pink Buttercups, Oenothera speciosa
- Pink Evening Primrose, Oenothera speciosa
- Pink Ladies, Oenothera speciosa
- Pink Mimosa, Calliandra eriophylla
- Pink Perezia, Acourtia wrightii
- Pink Plains Beardtongue, Penstemon ambiguus
- Pink Plains Penstemon, Penstemon ambiguus
- Pink Sandverbena, Abronia villosa
- Pink Sensitive Briar, Mimosa roemeriana
- Pink Vine, Antigonon leptopus
- Pink Windmills, Allionia incarnata
- Pinkbract Manzanita, Arctostaphylos pringlei
- Pinkbracted Manzanita, Arctostaphylos pringlei
- Pinked Mistflower, Conoclinium greggii
- Pinkthroat Morningglory, Ipomoea longifolia
- Pinkthroat Morning-glory, Ipomoea longifolia
- Pink-flowered Acacia, Calliandra eriophylla
- Pink-throat Morningglory, Ipomoea longifolia
- Pinnate Machaeranthera, Xanthisma spinulosum
- Pinnate Tansy Mustard, Descurainia pinnata
- Pinnate Tansymustard, Descurainia pinnata
- Pinpoint Clover, Trifolium gracilentum
- Pitayita, Peniocereus johnstonii
- Plains Blackfoot, Melampodium leucanthum
- Plains Blackfoot Daisy, Melampodium leucanthum
- Plains Coreopsis, Coreopsis tinctoria
- Plains Horsemint, Monarda citriodora
- Plains Prickly Pear, Opuntia macrorhiza
- Plains Sunflower, Helianthus petiolaris
- Plains Tickseed, Coreopsis tinctoria
- Plains Twistspine Pricklypear, Opuntia macrorhiza
- Plains Zinnia, Zinnia grandiflora
- Plateau Morningglory, Calystegia longipes
- Plumajillo, Achillea millefolium
- Plymouth Thistle, Carduus pycnocephalus
- Poinciana, Caesalpinia pulcherrima
- Pointleaf Manzanita, Arctostaphylos pungens
- Poison Ivy, Toxicodendron rydbergii
- Poison Oak, Toxicodendron rydbergii
- Poison Milkweed, Asclepias subverticillata
- Polecat Bush, Rhus trilobata var. trilobata
- Popcorn Flower, Plagiobothrys arizonicus
- Popinac, Vachellia farnesiana
- Popolo, Solanum americanum
- Poverty Weed, Monolepis nuttalliana
- Povertyweed, Monolepis nuttalliana
- Powderpuff Thistle, Cirsium neomexicanum
- Pricklyburr, Datura wrightii
- Prairie Acacia, Acachella angustissima
- Prairie Agoseris, Agoseris glauca
- Prairie Wattle, Acaciella angustissima
- Prairie Coneflower, Ratibida columnifera
- Prairie Dandelion, Agoseris glauca
- Prairie Dogweed, Dyssodia papposa
- Prairie Goldenrod, Solidago missouriensis
- Prairie Flax, Linum lewisii
- Prairie Skeletonplant, Stephanomeria pauciflora
- Prairie Spiderwort, Tradescantia occidentalis
- Prairie Sunflower, Helianthus petiolaris
- Prairieconeflower, Ratibida columnifera
- Pretty Dodder, Cuscuta indecora
- Prickleaf Dogweed, Thymophylla acerosa
- Pricklyleaf, Thymophylla pentachaeta
- Prickly Poppy, Argemone gracilenta
- Prickly Lettuce, Lactuca serriola
- Prickly Pear, Opuntia macrorhiza
- Prickly Russian Thistle, Salsola tragus
- Prickly Sow Thistle, Sonchus asper
- Prickly Sow-thistle, Sonchus asper
- Prickly Sowthistle, Sonchus asper
- Prickly Turnip, Brassica tournefortii
- Pricklyleaf Dogweed, Thymophylla acerosa
- Pride-of-Barbados, Caesalpinia pulcherrima
- Pringle Manzanita, Arctostaphylos pringlei
- Pringle's Eriophyllum, Eriophyllum pringlei
- Pringle's Manzanita, Arctostaphylos pringlei
- Pringle's Woolly Sunflower, Eriophyllum pringlei
- Procumbent Pigweed, Amaranthus blitoides
- Procumbent Sida, Sida abutifolia
- Procumbent Yellow-sorrel, Oxalis corniculata
- Prostrate Amaranth, Amaranthus blitoides
- Prostrate Pigweed, Amaranthus albus
- Prostrate Sida, Sida abutifolia
- Prostrate Verbena, Verbena bracteata
- Prostrate Vervain, Verbena bracteata
- Pualele, Sonchus oleraceus
- Puncture Vine, Tribulus terrestris
- Puncturevine, Tribulus terrestris
- Purple Aster, Dieteria canescens
- Purple Bladderpod, Lesquerella purpurea
- Purple Clarkia, Clarkia purpurea
- Purple Cluster Geranium, Geranium caespitosum
- Purple-fruited Prickly Pear, Opuntia phaeacantha
- Purple Geranium, Geranium caespitosum
- Purple Ground Cherry, Quincula lobata
- Purple Groundcherry, Quincula lobata
- Purple Heather, Krameria erecta
- Purple Lemon Mint, Monarda citriodora
- Purple Horsemint, Monarda citriodora
- Purple Mat, Nama hispidum
- Purple Mat, Nama demissum
- Purple Morningglory, Ipomoea capillacea
- Purple Morning-glory, Ipomoea capillacea
- Purple Nightshade (Common), Solanum americanum
- Purple Nightshade, Solanum xanti
- Purple Owl Clover, Castilleja exserta
- Purple Palmleaf Mistflower, Conoclinium greggii
- Purple Palmleaf Eupatorium, Conoclinium greggii
- Purpleroot Pick-me-Not, Cryptantha micrantha
- Purple-rooted Forget-me-Not, Cryptantha micrantha
- Purple Prickly Pear, Opuntia macrocentra
- Purple Pricklypear, Opuntia macrocentra
- Purple Prickly-pear, Opuntia macrocentra
- Purple Penstemon, Penstemon dasyphyllus
- Purple Stemodia, Stemodia durantifolia
- Purple Torch, Echinocereus engelmannii
- Purple Wild Geranium, Geranium caespitosum
- Purpleflower Groundcherry, Quincula lobata
- Purplemat, Nama demissum
- Purpleroot Pick-me-Not, Cryptantha micrantha
- Purple-rooted Forget-me-Not, Cryptantha micrantha
- Pursh Plantain, Plantago patagonica
- Purslane, Portulaca oleracea
- Pursley, Portulaca oleracea
- Pusley, Portulaca oleracea
- Pygmy Bluet, Houstonia wrightii
- Pygmy Cedar, Peucephyllum schottii
- Pygmy Goldenpoppy, Eschscholzia minutiflora
- Pygmy Poppy, Eschscholzia minutiflora
- Pygmycedar, Peucephyllum schottii
- Pyramid Bush, Melochia tomentosa
- Quailbush, Atriplex lentiformis
- Quail Plant, Heliotropium curassavicum
- Queen's Jewels, Antigonon leptopus
- Queen's Wreath, Antigonon leptopus
- Quinine Nut Simmondsia chinensis
- Quinine-bush, Purshia stansburiana
- Rabbitbush, Ambrosia deltoidea
- Rainbow Hedgehog Cactus, Echinocereus rigidissimus
- Ragged Nettlespurge, Jatropha macrorhiza
- Ragged Jatropha, Jatropha macrorhiza
- Ragged Rock Flower, Crossosoma bigelovii
- Ragged Rockflower, Crossosoma bigelovii
- Ragged Rock-flower, Crossosoma bigelovii
- Ramsted, Linaria vulgaris
- Range Ratany (Littleleaf), Krameria erecta
- Range Ratany, Krameria bicolor
- Range Ratany, Krameria erecta
- Range Rhatany, Krameria erecta
- Rattlebox, Crotalaria pumila
- Rattlebox, Senna covesii
- Rattlesnake Carrot, Daucus pusillus
- Rattlesnake Weed, Chamaesyce albomarginata
- Rattlesnake Weed, Crotalaria pumila
- Rattlesnake Weed, Daucus pusillus
- Rattleweed, Astragalus didymocarpus
- Rattleweed, Senna covesii
- Rayless Encelia, Encelia frutescens
- Rayless Goldenhead, Acamptopappus sphaerocephalus
- Rayless Goldenrod, Isocoma pluriflora
- Rayless Greenthread, Thelesperma megapotamicum
- Recurve Combseed, Pectocarya recurvata
- Redberry, Rhamnus crocea
- Redberry Buckthorn, Rhamnus crocea
- Red-berry Buck-thorn, Rhamnus crocea
- Redberry Juniper, Juniperus coahuilensis
- Redbrush Lippia, Lippia graveolens
- Redmaids, Calandrinia ciliata
- Redflower Mallow, Modiola caroliniana
- Redroot Catseye, Cryptantha micrantha
- Redroot Cryptantha, Cryptantha micrantha
- Redstem Filaree, Erodium cicutarium
- Redstem Stork's Bill, Erodium cicutarium
- Red-stem Stork's-bill, Erodium cicutarium
- Red Barberry, Berberis haematocarpa
- Red Beardtongue, Penstemon barbatus
- Red Bird-of-Paradise, Caesalpinia pulcherrima
- Red Chihuahuan Sage, Salvia greggii
- Red Devils Claw, Unicorn Plant, Proboscidea parviflora
- Red Fairy Duster, Calliandra californica
- Red Falsemallow, Sphaeralcea coccinea
- Red Four-O'clock, Mirabilis coccinea
- Red Dome Blanketflower, Gaillardia pinnatifid
- Red Mahonia, Berberis haematocarpa
- Red Mariposa Lily, Calochortus kennedyi
- Red Penstemon, Penstemon barbatus
- Red Spiderling, Boerhavia coccinea
- Red Willow, Cornus sericea
- Red-dome Blanketflower, Gaillardia pinnatifid
- Red-gland Spurge, Chamaesyce melanadenia
- Redosier Dogwood, Cornus sericea
- Red-dome Blanketflower, Gaillardia pinnatifid
- Red-osier Dogwood, Cornus sericea
- Red-rood, Cornus sericea
- Redtwig Dogwood, Cornus sericea
- Red-twig Dogwood, Cornus sericea
- Redwhisker Clammyweed, Polanisia dodecandra
- Red-whisker Clammyweed, Polanisia dodecandra
- Redspike Mexican Hat Ratibida columnifera
- Retama, Parkinsonia aculeata
- Rhyolite Bush, Crossosoma bigelovii
- Ribbed Melilot, Melilotus officinalis
- Richardson Geranium, Geranium richardsonii
- Richardson's Geranium, Geranium richardsonii
- Rigid Spineflower, Chorizanthe rigida
- Rio Grande Clammyweed, Polanisia dodecandra
- Rippleseed Plantain, Plantago major
- River Walnut, Juglans major
- Roble Negro, Quercus emoryi
- Rockcress, Boechera perennans
- Rocket Mustard, Sisymbrium irio
- Rock Daisy, Melampodium leucanthum
- Rock Echeveria, Dudleya collomiae saxosa
- Rock Purslane, Calandrinia ciliata
- Rock Rose, Pavonia lasiopetala
- Rocky Mountain White Oak, Quercus gambelii
- Rocky Mountain Zinnia, Zinnia grandiflora
- Roemer's Mimosa, Mimosa roemeriana
- Roemer’s Sensitive Briar, Mimosa roemeriana
- Roemer’s Mimosa, Mimosa roemeriana
- Rolled Leaf Spurge, Chamaesyce revoluta
- Romerillo, Chrysactinia mexicana
- Roquettet, Eruca vesicaria ssp. sativa
- Rosary Babybonnets, Coursetia glandulosa
- Rose Bladderpod Lesquerella purpurea
- Rose Evening Primrose, Oenothera rosea
- Rose Eveningprimrose, Oenothera rosea
- Rose Evening-primrose, Oenothera rosea
- Rose Heath, Chaetopappa ericoides
- Rose Mallow, Pavonia lasiopetala
- Rose Pavonia, Pavonia lasiopetala
- Rosering Gaillardia, Gaillardia pulchella
- Rosin Bush, Baccharis sarothroides
- Rosinweed, Grindelia squarrosa
- Rosy Desert Beardtongue, Penstemon pseudospectabilis
- Rosy Desert Penstemon, Penstemon pseudospectabilis
- Rosy Gilia, Gilia sinuata
- Rosy Phlox, Gilia sinuata
- Rosy Sierra Onion, Allium campanulatum
- Rothrock's Crownbeard, Verbesina rothrockii
- Rothrock Crownbeard, Verbesina rothrockii
- Rough-bark Arizona Cypress, Cupressus arizonica (= Hesperocyparis arizonica)
- Rough Cocklebur, Xanthium strumarium
- Rough Cockleburr, Xanthium strumarium
- Rough Menodora, Menodora scabra
- Roughseed Clammyweed, Polanisia dodecandra
- Roundleaf Mallow, Malva neglecta
- Royal Sandmat, Chamaesyce dioica
- Roving Sailor, Maurandella antirrhiniflora
- Ruby-Saltbush, Enchylaena tomentosa
- Roquette, Eruca vesicaria ssp. sativa
- Rusby's Globemallow, Sphaeralcea rusbyi
- Rusby’s Bitterweed, Hymenoxys rusbyi
- Rusby’s Rubberweed, Hymenoxys rusbyi
- Rush Milkweed, Asclepias subulata
- Russian Thistle, Salsola tragus
- Sabino, Arizona Cypress
- Sacahuista, Nolina microcarpa
- Sacred Datura, Datura wrightii
- Sacred Thorn-apple, Datura wrightii
- Sacred Thornapple, Datura wrightii
- Sage Tree Vitex agnus-castus
- Saguaro, Carnegiea gigantea
- Saguaro Cactus, Carnegiea gigantea
- Sagebrush Chorizanthe, Chorizanthe brevicornu
- Sahara Mustard, Brassica tournefortii
- Saint Joseph's Staff, Penstemon barbatus
- Saint Mary's Thistle, Silybum marianum
- Saints Cactus, Echinocereus engelmannii
- Salad Rocket, Eruca vesicaria ssp. sativa
- Salsifis Majeur, Tragopogon dubius
- Salsify, Tragopogon dubius
- Salt Cedar, Tamarix chinensis
- Salt Heliotrope, Heliotropium curassavicum
- Saltbush, Atriplex lentiformis
- Saltcedar, Tamarix chinensis
- Salt-cedar, Tamarix chinensis
- Sandbar Willow, Salix exigua
- Sanddune Wallflower, Erysimum capitatum
- Sand-dune Wallflower, Erysimum capitatum
- San Diego Nightshade, Solanum xanti
- San Felipe Dogweed, Adenophyllum porophylloides
- San Felipe Dyssodia, Adenophyllum porophylloides
- San Nicolas, Chrysactinia mexicana
- San Pedro Matchweed, Xanthocephalum gymnospermoides
- San Pedro Tick Trefoil, Desmodium batocaulon
- San Pedro Ticktrefoil, Desmodium batocaulon
- Sand Beardtongue, Penstemon ambiguus
- Sand Bells, Nama hispidum
- Sand Clover, Trifolium willdenovii
- Sand Fringepod, Thysanocarpus curvipes
- Sand Lacepod, Thysanocarpus curvipes
- Sand Penstemon, Penstemon ambiguus
- Sand Wash Groundsel, Senecio flaccidus var. monoensis
- Sandyseed Clammyweed, Polanisia dodecandra
- Santa Catalina Mountain Phlox, Phlox tenuifolia
- Santa Rita Prickly Pear, Opuntia santa-rita
- Santa Rita Pricklypear, Opuntia santa-rita
- Saramatraca, Peniocereus johnstonii
- Sawtooth Fogfruit, Phyla nodiflora
- Sawtooth Sage, Salvia subincisa
- Saw-tooth Sage Salvia subincisa
- Scaly Hawkbit, Hedypnois cretica
- Scarlet Beardtongue, Penstemon triflorus
- Scarlet Beeblossom, Oenothera suffrutescens
- Scarlet Betony, Stachys coccinea
- Scarlet Bugler, Penstemon barbatus
- Scarlet Creeper, Ipomoea cristulata
- Scarlet Four-O'clock, Mirabilis coccinea
- Scarlet Gaura, Oenothera suffrutescens
- Scarlet Gilia, Ipomopsis aggregata
- Scarlet Globemallow, Sphaeralcea coccinea
- Scarlet Guara, Oenothera suffrutescens
- Scarlet Hedgenettle, Stachys coccinea
- Scarlet Hedge-nettle Stachys coccinea
- Scarlet Lupine, Lupinus concinnus
- Scarlet Milkweed, Silkweed, Asclepias curassavica
- Scarlet Morning-glory, Ipomoea cristulata
- Scarlet Penstemon, Penstemon triflorus
- Scarlet Spiderling, Boerhavia coccinea
- Scarthgrass, Galium aparine
- Scented Lippia, Lippia graveolens
- Scented Matgrass, Lippia graveolens
- Scented Sumac, Rhus trilobata var. trilobata
- Schott Agave, Agave schottii
- Schott False Dalea, Psorothamnus schottii
- Schott's Calico, Loeseliastrum schottii
- Schott's Century Plant, Agave schottii
- Schott's Dalea, Psorothamnus schotti
- Schott's Pygmycedar, Peucephyllum schottii
- Scorpion-weed, Phacelia crenulata
- Screw Bean Mesquite, Prosopis pubescens
- Screwbean, Prosopis pubescens
- Screwpod Mesquite, Prosopis pubescens
- Scrubby Dogweed, Thymophylla acerosa
- Scrub Oak, Quercus gambelii
- Scrub Sumac, Rhus microphylla
- Scruffy Prairie Clover, Dalea albiflora
- Seaside Heliotrope, Heliotropium curassavicum
- Seaside Petunia, Calibrachoa parviflora
- Seaside-petunia, Calibrachoa parviflora
- Seedticks, Daucus pusillus
- Seep Monkeyflower, Mimulus guttatus
- Seep Willow, Baccharis salicifolia
- Seepwillow, Baccharis salicifolia
- Seepwillow Baccharis, Baccharis salicifolia
- Sego Lily, Calochortus nuttallii
- Sego-lily, Calochortus nuttallii
- Sensitive Briar, Mimosa roemeriana
- Sensitive Plant, Mimosa roemeriana
- Serviceberry, Amelanchier utahensis
- Shadscale, Atriplex canescens
- Shame Vine, Mimosa roemeriana
- Sharpleaf Groundcherry, Physalis acutifolia
- Sharptooth Sage, Salvia subincisa
- Sharp-fringed-Sowthistle, Sonchus asper
- Sheep Sorrel, Oxalis stricta
- Sheep Thistle, Carduus pycnocephalus
- Shepardspurse, Capsella bursa-pastoris
- Shepherd's Purse, Capsella bursa-pastoris
- Shepherd's-purse, Capsella bursa-pastoris
- Shepherdspurse, Capsella bursa-pastoris
- Shindagger, Agave lechuguilla
- Shindagger, Agave schottii
- Shoestring Weed, Hoffmannseggia glauca
- Shore Thistle, Carduus pycnocephalus
- Short-beaked Agoseris, Agoseris glauca
- Showy Desert Marigold, Baileya multiradiata
- Showy Dodder, Cuscuta indecora
- Showy Evening Primrose, Oenothera speciosa
- Showy Eveningprimrose, Oenothera speciosa
- Showy Phlox, Phlox speciosa
- Showy Primrose, Oenothera speciosa
- Showy Sunflower, Helianthus niveus
- Shrub Live Oak, Quercus turbinella
- Shrub Marigold, Tagetes lemmonii
- Shrub Oak, Quercus turbinella
- Shrubby Buckwheat, Eriogonum wrightii
- Shrubby Butterweed, Senecio flaccidus var. monoensis
- Shrubby Deervetch, Lotus rigidus
- Shrubby Goldeneye, Bahiopsis parishii
- Shrubby Purslane, Portulaca suffrutescens
- Shrubby Zinnia, Zinnia acerosa
- Siberian Dogwood, Cornus sericea
- Sierra Onion, Allium campanulatum
- Siler's Penstemon, Penstemon linarioides
- Silk Tassel, Garrya wrightii
- Silkweed, Asclepias curassavica
- Silky Evolvulus, Evolvulus sericeus
- Silverleaf Nightshade, Solanum elaeagnifolium
- Silverpuffs, Microseris lindleyi
- Silversheath Knotweed, Polygonum argyrocoleon
- Silver Dwarf Morningglory, Evolvulus sericeus
- Silver Dwarf Morning-glory, Evolvulus sericeus
- Silver Dwarf-morning-glory, Evolvulus sericeus
- Silver Holly, Atriplex hymenelytra
- Silver Mountain Mahogany, Cercocarpus montanus
- Silver-leaf Nightshade, Solanum elaeagnifolium
- Silver-sheath Knotweed, Polygonum argyrocoleon
- Singlewhorl Burrobrush, Ambrosia monogyra
- Singlewhorl Burrobush, Ambrosia monogyra
- Skeleton Weed, Eriogonum abertianum
- Skeleton Weed, Eriogonum deflexum
- Skeleton Weed, Eriogonum trichopes
- Skeletonplant, Stephanomeria exigua
- Skeletonweed Buckwheat, Eriogonum deflexum
- Skunkflower, Ipomopsis aggregata
- Skyrocket, Ipomopsis aggregata
- Skyrocket Gilia, Ipomopsis aggregata
- Skunktop, Pediomelum mephiticum
- Skunkbush Sumac, Rhus trilobata var. trilobata
- Skunk Bush, Rhus trilobata var. trilobata
- Sleeping Beauty, Oxalis corniculata
- Slender Clover, Trifolium gracilentum
- Slender Cryptantha, Cryptantha gracilis
- Slender Dayflower, Commelina erecta
- Slender Day-flower, Commelina erecta
- Slender Gaillardia, Gaillardia pinnatifid
- Slender Goldenweed, Xanthisma gracilis
- Slender Janusia, Cottsia gracilis
- Slender Phlox, Phlox (Microsteris) gracilis
- Slender Poreleaf, Porophyllum gracile
- Slender Thistle, Carduus pycnocephalus
- Slender Winged Thistle, Carduus pycnocephalus
- Slender-flower Thistle, Carduus pycnocephalus
- Slenderpod Jewelflower, Caulanthus lasiophyllus
- Slendertube Ipomopsis, Ipomopsis tenuituba
- Slendertube Skyrocket, Ipomopsis tenuituba
- Slender-tube Skyrocket, Ipomopsis tenuituba
- Slimleaf Bean, Phaseolus angustissimus
- Slimleaf Goldenbush, Ericameria linearifolia
- Slimleaf Plains Mustard, Hesperidanthus linearifolius
- Slimleaf Plainsmustard, Hesperidanthus linearifolius
- Slimjim Bean, Phaseolus filiformis
- Small Desert Star, Monoptilion bellidiforme
- Small Evening Primrose, Camissonia micrantha
- Small Flower Petunia, Calibrachoa parviflora
- Small Flower Stock, Matthiola parviflora
- Small Matweed, Guilleminea densa
- Small Wirelettuce, Stephanomeria exigua
- Smallflower Aster, Chaetopappa ericoides
- Smallflower Mallow, Malva parviflora
- Smallflower Nightshade, Solanum americanum
- Smallflowered, Convolvulus arvensis
- Smallflowered Gaura, Oenothera curtiflora
- Small-flowered Blazing Star, Mentzelia albicaulis
- Small-flowered Sweet Clover, Melilotus indicus
- Small-flowered Mallow, Malva parviflora
- Small-flowered Marshmallow, Malva parviflora
- Small-flowered Nightshade, Solanum americanum
- Small-leaf Anglepod, Spearleaf, Matelea parvifolia
- Small-leaf Geigertree, Cordia parvifolia
- Smallleaf Cordia, Cordia parvifolia
- Smallhead Snakeweed, Gutierrezia microcephala
- Smoke Thorn, Psorothamnus spinosus
- Smoke Tree, Psorothamnus spinosus
- Smokethorn Dalea, Psorothamnus spinosus
- Smokethorn, Psorothamnus spinosus
- Smoketree, Psorothamnus spinosus
- Smooth Ash, Fraxinus velutina
- Smooth Beggartick, Bidens laevis
- Smooth Bidens, Bidens laevis
- Smooth Bur Marigold, Bidens laevis
- Smooth Desert Dandelion, Malacothrix glabrata
- Smooth Desertdandelion, Malacothrix glabrata
- Smooth Pucoon, Lithospermum cobrense
- Smooth Threadleaf Ragwort, Senecio flaccidus var. monoensis
- Smooth Trailing Four O'clock, Allionia choisyi
- Smooththroat Gromwell, Lithospermum cobrense
- Smooththroat Stoneseed, Lithospermum cobrense
- Snakeroot, Aristolochia watsonii
- Snakeweed, Gutierrezia microcephala
- Snakeweed, Gutierrezia sarothrae
- Snapdragon Penstemon, Keckiella antirrhinoides
- Snapdragon Vine, Maurandella antirrhiniflora
- Snowy Sunflower, Helianthus niveus
- Soapberry, Sapindus saponaria
- Soap Tree Yucca, Yucca elata
- Soaptree Yucca, Yucca elata
- Soapweed, Yucca elata
- Soap-weed Yucca, Yucca elata
- Soft Prairie Clover, Dalea mollissima
- Sonoran Globe Amaranth, Gomphrena sonorae
- Sonoran Nightshade, Solanum hindsianum
- Sonoran Prickly Poppy, Argemone gracilenta
- Sonoran Pricklypoppy, Argemone gracilenta
- Sonoran Scrub Oak, Quercus turbinella
- Sore-eye Poppy, Sphaeralcea ambigua
- Sotol, Dasylirion wheeleri
- Sour Clover, Melilotus indicus
- Sourgrass, Oxalis stricta
- South African Daisy, Verbesina encelioides
- Southern Cattail, Typha domingensis
- Southern Cat-tail, Typha domingensis
- Southern Goldenbush, Isocoma pluriflora
- Southern Island Clover, Trifolium gracilentum
- Southern Jimmyweed, Isocoma pluriflora
- Southern Pepperweed, Lepidium alyssoides
- Southwest Coral Bean, Erythrina flabelliformis
- Southwest Wild Carrot, Daucus pusillus
- Southwestern Barrel Cactus, Ferocactus wislizeni
- Southwestern Cosmos, Cosmos parviflorus
- Southwestern Peach Willow, Salix amygdaloides
- Southwestern Pipevine, Aristolochia watsoni
- Southwestern Pricklypoppy, Argemone pleiacantha
- Southwestern Prickly Poppy, Argemone pleiacantha
- Southwestern Yellow Columbine, Aquilegia chrysantha
- Sowbane, Chenopodiastrum murale
- Sow Thistle, Sonchus oleraceus
- Sow-thistle, Sonchus asper
- Sow-thistle, Sonchus oleraceus
- Soyate, Yucca rostrata
- Spanish Bayonet, Yucca baccata
- Spanish Bayonet, Yucca faxoniana
- Spanish Dagger, Yucca faxoniana
- Spanish Needles, Palafoxia arida
- Spanish Needles, Palafoxia arida var. arida
- Spearleaf, Matelea parvifolia
- Spectacle Pod, Dimorphocarpa wislizeni
- Spectaclepod, Dimorphocarpa wislizeni
- Spider Antelope-horns, Asclepias asperula
- Spider Milkweed, Asclepias asperula
- Spiderling, Boerhavia coulteri
- Spiderling, Boerhavia intermedia
- Spiderling, Boerhavia wrightii
- Spiderwort Tradescantia occidentalis
- Spine Herb, Chorizanthe rigida
- Spiny Cholla, Cylindropuntia spinosior
- Spiny Chorizanthe, Chorizanthe rigida
- Spiny Goldenweed, Xanthisma spinulosum
- Spiny Hackberry, Celtis pallida
- Spiny Haplopappus, Xanthisma spinulosum
- Spiny Redberry, Rhamnus crocea
- Spiny Sow-thistle, Sonchus asper
- Spiny Sowthistle, Sonchus asper
- Spiny-leaf Sow Thistle, Sonchus asper
- Spinyleaf Zinnia, Zinnia acerosa
- Spotted Knapweed, Centaurea melitensis
- Spotted Knapweed, Centaurea melitensis
- Spotted Thistle, Silybum marianum
- Spreadfruit Goldenbanner, Thermopsis divaricarpa
- Spreading Daisy, Erigeron divergens
- Spreading Fanpetals, Sida abutifolia
- Spreading Daisy, Erigeron divergens
- Spreading Goldenbean, Thermopsis divaricarpa
- Spreading Sida, Sida abutifolia
- Spreading Snakeherb, Dyschoriste schiedeana var. decumbens
- Springbank Clover, Trifolium willdenovii
- Spring Whitlow-grass, Draba cuneifolia
- Spurge, Chamaesyce albomarginata
- Spurge, Chamaesyce arizonica
- Spurge, Chamaesyce capitellata
- Spurge, Chamaesyce florida
- Spurge, Chamaesyce pediculifera
- Spurge, Chamaesyce setiloba
- Spurred Anoda Anoda cristata
- Squaw Bush, Rhus trilobata var. trilobata
- Squaw Sandmat, Chamaesyce melanadenia
- Squaw-bush, Condalia warnockii
- Squawfeather, Castilleja integra
- St. Barnaby's Thistle, Centaurea solstitialis
- Standley Ash, Fraxinus velutina
- Stansbury Cliffrose, Purshia stansburiana
- Stansbury's Cliffrose, Purshia stansburiana
- Starpoint Microseris, Microseris lindleyi
- Starry Bedstraw, Galium stellatum
- Stickpea, Calliandra eriophylla
- Stickseed, Bidens bigelovii
- Stinkweed, Gutierrezia sarothrae
- Stemless Townsend Daisy, Townsendia exscape
- Steve's Dusty Maiden, Chaenactis stevioides
- Steve's Dustymaiden, Chaenactis stevioides
- Steve's Pincushion, Chaenactis stevioides
- Stickleaf, Mentzelia multiflora
- Sticky-willy, White Hedge, Galium aparine
- Stinknet, Oncosiphon piluliferum
- Stinkweed, Gutierrezia sarothrae
- Stock, Matthiola parviflora
- Stork's Bill, Erodium cicutarium
- Storksbill, Erodium cicutarium
- Straighttube Unicorn Plant, Proboscidea althaeifolia
- Strawberry Cactus, Echinocereus engelmannii
- Strawberry Hedgehog, Echinocereus engelmannii
- Strawberry Hedgehog Cactus, Echinocereus engelmannii
- Straw-bed Pincushion, Chaenactis carphoclinia var. carphoclinia
- Streambank Springbeauty, Claytonia parviflora
- Sugar Bush, Rhus ovata
- Sugar-bush, Rhus ovata
- Sugar Hackberry, Celtis reticulata
- Sugar Sumac, Rhus ovata
- Sulfur Buckwheat, Eriogonum umbellatum
- Sulfur Flower, Eriogonum umbellatum
- Sulfer Flower Buckwheat, Eriogonum umbellatum
- Sulfur Eriogonum, Eriogonum umbellatum
- Sulphur Wildbuckwheat, Eriogonum umbellatum
- Sulphur-flower Buckwheat, Eriogonum umbellatum
- Summer Poppy, Kallstroemia grandiflora
- Sun Cups, Chylismia brevipes
- Sun Spurge, Euphorbia radians
- Sundance, Gaillardia pulchella
- Sunflower, Helianthus annuus
- Sunflower, Helianthus petiolaris
- Sunset Crater Beardtongue, Penstemon clutei
- Sunset Crater Penstemon, Penstemon clutei
- Superb Beardtongue, Penstemon superbus
- Superb Penstemon, Penstemon superbus
- Superstition Mallow, Abutilon palmeri
- Sweet Acacia, Vachellia farnesiana
- Sweet Clover, Melilotus indicus
- Sweet Melilot, Melilotus indicus
- Sweetbush, Bebbia juncea
- Sweetbush Bebbia, Bebbia juncea
- Swines, Sonchus oleraceus
- Switch Sorrel, Dodonaea viscosa
- Tacate, Juniperus deppeana
- Tackstem, Calycoseris parryi
- Tascate, Juniperus deppeana
- Tackstem, Calycoseris wrightii
- Tahitian Kidneywood, Eysenhardtia orthocarpa
- Takhoka-daisy, Machaeranthera tenacetifolia
- Tall Coneflower Rudbeckia laciniata
- Tall Indigo, Sesbania herbacea
- Tall Mountain Larkspur, Delphinium scaposum
- Tamarisk, Tamarix chinensis
- Tamarix, Tamarix chinensis
- Tangerine-scented Marigold, Tagetes lemmonii
- Tanseyleaf Aster, Machaeranthera tenacetifolia
- Tanseyleaf Goldenweed, Machaeranthera tenacetifolia
- Tansyleaf Tansyaster, Machaeranthera tenacetifolia
- Tansy Mustard, Descurainia pinnata
- Tansymustard, Descurainia pinnata
- Tarweed, Grindelia squarrosa
- Táscate, Cupressus arizonica
- Tatarian Dogwood Cornus sericea
- Teabush, Melochia tomentosa
- Teddy Bear Cholla, Cylindropuntia bigelovii
- Tehachapi Rose, Rosa woodsii
- Telegraph Weed, Heterotheca subaxillaris
- Tesajo Cactus, Cylindropuntia leptocaulis
- Texas Catclaw Acacia greggii
- Texas Betony, Stachys coccinea
- Texas Bindweed, Convolvulus equitans
- Texas Dogweed, Thymophylla acerosa
- Texas Filaree, Erodium texanum
- Texas Fillarie, Erodium texanum
- Texas Frogfruit, Phyla nodiflora
- Texas Honeysuckle, Lonicera albiflora
- Texas Sandbur, Tribulus terrestris
- Texas Sugarberry, Celtis reticulata
- Texas Huisache, Vachellia farnesiana
- Texas Milkvine, Matelea producta
- Texas Mulberry, Morus microphylla
- Texas Myulberry, Morus microphylla
- Texas Red Sage, Salvia greggii
- Texas Sage, Salvia greggii
- Texas Snakeweed, Gutierrezia sarothrae
- Texas Stork's Bill, Erodium texanum
- Texas Swampmallow, Pavonia lasiopetala
- Texas Thistle, Solanum rostratum
- Texas Virgin Bower, Clematis drummondii
- Texas Zinnia, Zinnia grandiflora
- Thick-leafed Groundcherry, Physalis crassifolia
- Thickleaf Groundcherry, Physalis crassifolia
- Thimbleweed, Rudbeckia laciniata
- Thistle, Cirsium ochrocentrum
- Treadleaf Groundsel, Senecio flaccidus var. flaccidus
- Threadstem Sandmat, Chamaesyce revoluta
- Threadstem Spurge, Chamaesyce revoluta
- Thread-stem Broomspurge, Chamaesyce revoluta
- Thread-stem Sandmat, Chamaesyce revoluta
- Three-horned Stock, Matthiola parviflora
- Thickbark Cedar, Juniperus deppeana
- Thicket Globe-mallow, Sphaeralcea fendleri
- Thimble-berry, Rubus neomexicanus
- Thompson Yucca, Yucca rostrata
- Tompson's Yucca, Yucca rostrata
- Thornapple, Datura wrightii
- Threadleaf Broomweed, Gutierrezia microcephala
- Threadleaf Ragwort, Senecio flaccidus var. flaccidus
- Threadleaf Snakeweed, Gutierrezia microcephala
- Threadstalk Chinchweed, Pectis filipes
- Three-leaf Snakeweed, Gutierrezia microcephala
- Three-seeded Mercury, Acalypha neomexicana
- Throwup Weed, Amoreuxia palmatifida
- Thurber's Desert Honeysuckle, Anisacanthus thurberi
- Thurber's Desertpeony, Acourtia thurberi
- Thurber's Giant-trumpets, Macromeria viridiflora
- Thurber Perezia, Acourtia thurberi
- Tick Clover, Desmodium batocaulon
- Tickseed, Bidens leptocephala
- Tidy Tips, Layia glandulosa
- Tlascal, Juniperus deppeana
- Toad Sorrel, Oxalis stricta
- Toadflax Beardtongue, Penstemon linarioides
- Toadflax Penstemon, Penstemon linarioides
- Tobacco Plant, Nicotiana obtusifolia
- Tobacco-weed, Atrichoseris platyphylla
- Tocalote, Centaurea melitensis
- Tocolote, Centaurea melitensis
- Tomato Weed, Solanum elaeagnifolium
- Tomcat Clover, Trifolium willdenovii
- Toothed Bur Clover, Medicago polymorpha
- Toothed Medick, Medicago polymorpha
- Torote Blanco, Pachycormus discolor
- Torrey's Cat's-Eye, Cryptantha torreyana
- Torrey's Craglily, Echeandia flavescens
- Torreys Cryptanth, Cryptantha torreyana
- Torrey's Cryptantha, Cryptantha torreyana
- Toumey Agave, Agave toumeyana
- Toumey Agave, Agave toumeyana v bella
- Toumey Ash, Fraxinus velutina
- Toumey-cane Cholla, Cylindropuntia spinosior
- Toumey's Agave, Agave toumeyana
- Toumey's Agave, Agave toumeyana v bella
- Toumey's Century Plant, Agave toumeyana
- Toumey's Century Plant, Agave toumeyana v bella
- Toumey's Groundsel, Packera neomexicana
- Toumey's Ragwort, Packera neomexicana
- Touristplant, Dimorphocarpa wislizeni
- Tournefort's Birdrape, Brassica tournefortii
- Trailing Allionia, Allionia incarnata
- Trailing Four O'clock, Allionia incarnata
- Trailing Four-O'clock, Allionia incarnata
- Trailing Windmills, Allionia incarnata
- Transpecos Morningglory, Ipomoea cristulata
- Transpecos Morning-glory, Ipomoea cristulata
- Trans-Pecos Morningglory, Ipomoea cristulata
- Trans-Pecos Morning-glory, Ipomoea cristulata
- Trans-Pecos Thimblehead, Hymenothrix wislizeni
- Trans-Pecos Thimblehead, Hymenothrix wislizeni
- Trans-Pecos Yucca, Yucca rostrata
- Tree of Heaven, Ailanthus altissima
- Tree Tobacco, Nicotiana glauca
- Triangle Bur Ragweed, Ambrosia deltoidea
- Triangle Bursage, Ambrosia deltoidea
- Triangle-leaf Bursage, Ambrosia deltoidea
- Tripleleaf Morning-glory, Ipomoea ternifolia
- Trixis, Trixis california
- Trompillo, Solanum elaeagnifolium
- Tropical Soapberry, Sapindus saponaria
- Truckee Barberry, Berberis repens
- True Mountain Mahogany, Cercocarpus montanus
- True Mountainmahogany, Cercocarpus montanus
- Tuber Anemone, Anemone tuberosa
- Tuberous Sida, Rhynchosida physocalyx
- Tulip Pricklypear, Opuntia phaeacantha
- Tulip Prickly Pear, Opuntia phaeacantha
- Tumble Mustard, Sisymbrium irio
- Turbinella Oak, Quercus turbinella
- Turbinella, Quercus turbinella
- Turkey Tangle, Phyla nodiflora
- Turkey Tangle Fogfruit, Phyla nodiflora
- Turpentine Weed, Yellow Top, Gutierrezia sarothrae
- Turtleback, Psathyrotes ramosissima
- Trumpet Flower, Chilopsis linearis
- Trumpetbush, Tecoma stans
- Trumpetflower, Tecoma stans
- Tufted Ball Clover, Gomphrena caespitosa
- Tufted Evening Primrose, Oenothera caespitosa
- Tufted Filaree, Erodium texanum
- Tufted Geranium Geranium caespitosum
- Tufted Globe Amaranth, Gomphrena caespitosa
- Tufted Evening-primrose, Oenothera caespitosa
- Tumbleweed Pigweed, Amaranthus albus
- Tumbleweed, Amaranthus albus
- Tumbleweed, Salsola tragus
- Tumbling Thistle, Salsola tragus
- Tuna, Opuntia engelmannii
- Turkey Tangle, Phyla nodiflora
- Turkey Tangle Fogfruit, Phyla nodiflora
- Turkshead, Chorizanthe rigida
- Turnip Weed, Brassica tournefortii
- Turpentine Broom, Thamnosma montana
- Turpentine Brush, Ericameria laricifolia
- Turpentine Bush, Ericameria laricifolia
- Turpentine Bush, Ericameria linearifolia
- Turpentine Weed, Gutierrezia sarothrae
- Turpentinebroom, Thamnosma montana
- Turpentinebush, Ericameria laricifolia
- Two Seeded Milkvetch, Astragalus didymocarpus
- Twinberry, Menodora scabra
- Twinfruit, Menodora scabra
- Twine-vine, Sarcostemma cynanchoides
- Twinleaf Senna, Senna bauhinioides
- Twinthorn Acacia, Vachellia constricta
- Twistspine Pricklypear, Opuntia macrorhiza
- Twist-spine Prickly Pear, Opuntia macrorhiza
- Umbrellawort, Allionia choisyi
- Umbrella-wort, Allionia choisyi
- Unicorn Plant, Proboscidea parviflora
- Upright Blue Beardtongue, Penstemon virgatus
- Upright Blue Penstemon, Penstemon virgatus
- Upright Prairie Coneflower, Ratibida columnifera
- Upright Yellow Woodsorrel, Oxalis stricta
- Upright Yellow Wood-sorrel, Oxalis stricta
- Utah Juniper, Juniperus osteosperma
- Utah Serviceberry, Amelanchier utahensis
- Utah Shadberry, Amelanchier utahensis
- Utah Thistle, Cirsium neomexicanum
- Utah White Oak, Quercus gambelii
- Valley Willow, Salix gooddingii
- Variableleaf Bushbean, Macroptilium gibbosifolium
- Variable-leaf Scorpion-weed Phacelia heterophylla
- Variegated Thistle, Silybum marianum
- Varileaf Phacelia, Phacelia heterophylla
- Varnish Leaf, Dodonaea viscosa
- Veatch's Blazingstar, Mentzelia veatchiana
- Veiny Brickellbush, Brickellia venosa
- Velvet Dock, Verbascum thapsus
- Velvet Plant, Verbascum thapsus
- Velvetweed, Oenothera curtiflora
- Velvet Ash, Fraxinus velutina
- Velvet Cushion, Psathyrotes ramosissima
- Velvet Turtleback, Psathyrotes ramosissima
- Velvet Weed, Willow Gaura, Oenothera curtiflora
- Velvet-leaf Mallow, Allowissadula holosericea
- Velvety Gaura, Oenothera curtiflora
- Velvetpod Mimosa, Mimosa dysocarpa
- Verdolaga, Portulaca oleracea
- Violet Snapdragon, Sairocarpus nuttallianus
- Violet Toad's-mouth, Sairocarpus nuttallianus
- Violettas, Anoda cristata
- Virgate Phacelia, Phacelia heterophylla
- Virgin River Brittlebush, Encelia virginensis
- Virgin Thistle, Cirsium mohavense
- Virgin's Bower, Clematis drummondii
- Vitex, Vitex agnus-castus
- Wafer Ash, Ptelea trifoliata
- Wait-a-Minute Bush, Acacia greggii
- Wait-a-Minute Bush, Mimosa aculeaticarpa biuncifera
- Walkingstick Cactus, Cylindropuntia spinosior
- Wall Goosefoot, Chenopodiastrum murale
- Wallace Eriophyllum, Eriophyllum wallacei
- Wallflower, Erysimum capitatum
- Wand Holdback, Hoffmannseggia microphylla
- Wand Phacelia, Phacelia heterophylla
- Warnock Condalia, Condalia warnockii
- Warnock's Snakewood, Condalia warnockii
- Washerwoman, Alternanthera caracasana
- Water Speedwell, Veronica anagallis-aquatica
- Water-wally, Baccharis salicifolia
- Watson's Dutchman's Pipe, Aristolochia watsonii
- Wedgeleaf Draba, Draba cuneifolia
- Wedgeleaf Whitlowgrass, Draba cuneifolia
- West Texas Juniper, Juniperus monosperma
- Western Black Oak, Quercus emoryi
- Western Black Willow, Salix gooddingii
- Western Clammyweed, Polanisia dodecandra
- Western Dogwood, Cornus sericea
- Western Eveningprimrose, Oenothera elata
- Western Goat's Beard, Tragopogon dubius
- Western Hackberry, Celtis reticulata
- Western Honey Mesquite, Prosopis juliflora var. torreyana
- Western Hoptree, Ptelea trifoliata
- Western Jimson Weed Datura wrightii
- Western Juniper, Juniperus deppeana
- Western Pearly Everlasting, Anaphalis margaritacea
- Western Poison Ivy, Toxicodendron rydbergii
- Western Pricklypear, Opuntia macrorhiza
- Western Salsify, Tragopogon dubius
- Western Serviceberry, Amelanchier utahensis
- Western Soapberry, Sapindus saponaria
- Western Spiderwort, Tradescantia occidentalis
- Western Sweet Acacia, Vachellia farnesiana
- Western Tansymustard, Descurainia pinnata
- Western Wallflower, Erysimum capitatum
- Western White Honeysuckle, Lonicera albiflora
- Western White Bladderpod, Lesquerella purpurea
- Western Whorled Milkweed, Asclepias subverticillata
- Western Wild Rose, Rosa woodsii
- Western Yarrow, Achillea millefolium
- Wheelscale, Atriplex elegans
- Wheelscale Orach, Atriplex elegans
- Wheelscale Saltbush, Atriplex elegans
- Wild Tea, Thelesperma megapotamicum
- White-scale Saltbush, Atriplex elegans
- Whisperingbells, Emmenanthe penduliflora
- White Aster, Symphyotrichum ericoides var. ericoides
- White Ball Acacia, Acacellia angustissima
- White Blazingstar, Mentzelia albicaulis
- White Brittlebush, Encelia farinosa
- White Burrobrush, Ambrosia salsola
- White Burrobush, Ambrosia solsola
- White Bursage, Ambrosia dumosa
- White Bush Honeysuckle, Lonicera albiflora
- White Crucillo, Ziziphus obtusifolia
- White Easterbonnets, Eriophyllum lanosum
- White Easter-bonnets, Eriophyllum lanosum
- White Evolvulus, Evolvulus sericeus
- White Flower Dalea, Dalea albiflora
- White Flowered Gilia, Ipomopsis longiflora
- White Hedge, Galium aparine
- White Heath Aster, Symphyotrichum ericoides var. ericoides
- White Honeysuckle, Lonicera albiflora
- White Horehound, Marrubium vulgare
- White Horsenettle, Solanum elaeagnifolium
- White Horse-nettle, Solanum elaeagnifolium
- White Limestone Honeysuckle, Lonicera albiflora
- White Mallow, Eremalche exilis
- White Nightshade, Solanum elaeagnifolium
- White Pigweed, Amaranthus albus
- White Prairie Aster, Symphyotrichum ericoides var. ericoides
- White Ragweed, Ambrosia solsola
- White Ratany, Krameria bicolor
- White Rhatany, Krameria bicolor
- White Shrub Honeysuckle, Lonicera albiflora
- White Sweetclover, Melilotus officinalis
- White Sweet-clover, Melilotus officinalis
- White Tackstem, Calycoseris wrightii
- White Thorn Acacia, Vachellia constricta
- White Tidytips, Layia glandulosa
- White Woolly Daisy, Eriophyllum lanosum
- Whiteball Acacia, Acaciella angustissima
- White-ball Acacia, Acaciella angustissima
- White-Plume Wire-Lettuce, Stephanomeria exigua
- White-thistle, Atriplex lentiformis
- Whitebark Raspberry, Rubus leucodermis
- Whitedaisy Tidytips, Layia glandulosa
- Whiteflower Prairie Clover, Dalea albiflora
- Whiteflower Prairieclover, Dalea albiflora
- White-flower Skyrocket,Ipomopsis longiflora
- Whiteflowered Gilia, Ipomopsis longiflora
- Whitemargin Eupatorium, Chamaesyce albomarginata
- Whitemargin Euphorbia, Chamaesyce albomarginata
- Whitemargin Sandmat, Chamaesyce albomarginata
- White-mallow, Eremalche exilis
- White-margin Sandmat, Chamaesyce albomarginata
- Whitemargin Spurge, Chamaesyce albomarginata
- Whitestem Blazingstar, Mentzelia albicaulis
- Whitestem Blazingstar, Mentzelia veatchiana
- Whitemouth Dayflower, Commelina erecta
- White-mouth Dayflower Commelina erecta
- Whitestem Paperflower, Psilostrophe cooperi
- Whitestem, Psilostrophe cooperi
- Whitestem Stickleaf, Mentzelia albicaulis
- Whitestem Stickleaf, Mentzelia veatchiana
- Whitethorn Acacia, Vachellia constricta
- White-thorn Acacia, Vachellia constricta
- Whitewoolly Twintip, Stemodia durantifolia
- White-woolly Twintip, Stemodia durantifolia
- Wholeleaf Indian Paintbrush, Castilleja integra
- Whoolly Daisy, Eriophyllum lanosum
- Whorled Milkweed, Asclepias subverticillata
- Widow's Tears, Commelina erecta
- Wiggins Croton, Croton wigginsii
- Wild Balsam Apple Echinopepon wrightii
- Wild Balsam-apple, Echinopepon wrightii
- Wild Bushbean, Macroptilium gibbosifolium
- Wild Carrot, Daucus pusillus
- Wild Cosmos, Cosmos parviflorus
- Wild Cucumber, Marah gilensis
- Wild Dwarf Morningglory, Evolvulus arizonicus
- Wild Dwarf Morning-glory, Evolvulus arizonicus
- Wild Geranium, Geranium caespitosum
- Wild Geranium, Geranium carolinianum
- Wild Goldenglow, Rudbeckia laciniata
- Wild Hazel, Simmondsia chinensis
- Wild Heliotrope, Phacelia distans
- Wild Hempsesbania, Sesbania herbacea
- Wild Hemp-sesbania, Sesbania herbacea
- Wild Lettuce, Lactuca serriola
- Wild Oysterplant, Tragopogon dubius
- Wild Parsley, Cymopterus lemmonii
- Wild Parsley, Lomatium nevadense
- Wild Portulaca, Portulaca oleracea
- Wild Potato, Solanum fendleri
- Wild Rose, Rosa woodsi
- Wild Snapdragon, Linaria vulgaris
- Wild Sunflower, Helianthus annuus
- Wild Turnip, Brassica tournefortii
- Wild Zinnia, Zinnia acerosa
- Wild Zinnia, Zinnia peruviana
- Willow Gaura, Oenothera curtiflora
- Willow Weed, Persicaria lapathifolia
- Willow-leaf Catalpa, Chilopsis linearis
- Wind Witch, Salsola tragus
- Windwitch, Salsola tragus
- Winecup, Clarkia purpurea
- Winecup Clarkia, Clarkia purpurea
- Winged Pick-Me-Not, Cryptantha pterocarya
- Winged-nut Cryptantha, Cryptantha pterocary
- Wingnut Catseye, Cryptantha pterocarya
- Wing-Nut Cat's-Eye, Cryptantha pterocarya
- Wing-nut Forget-Me-Not, Cryptantha pterocarya
- Winged Slender Thistle, Carduus pycnocephalus
- Wingleaf Soapberry, Sapindus saponaria
- Wingnut Cryptantha, Cryptantha pterocarya
- Wing-scale, Atriplex canescens
- Winter Purslane, Claytonia perfoliata
- Wire Lettuce, Stephanomeria exigua
- Wire Lettuce, Stephanomeria pauciflora
- Wire-Lettuce, Stephanomeria pauciflora
- Wislizeni's Spectaclepod, Dimorphocarpa wislizeni
- Wright Buckwheat, Eriogonum wrightii
- Wright Deervetch, Lotus wrightii
- Wright Groundcherry, Physalis acutifolia
- Wright Peachleaf Willow, Salix amygdaloides
- Wright Silktassel, Garrya wrightii
- Wright Stanleyella, Thelypodium wrightii
- Wright Thelypody, Thelypodium wrightii
- Wright Willow, Salix amygdaloides
- Wright's Beeflower, Hymenothrix wrightii
- Wright's Boerhavia, Boerhavia wrightii
- Wright's Buckwheat, Eriogonum wrightii
- Wright's Deervetch, Lotus wrightii
- Wright’s Desertpeony, Acourtia wrighti
- Wright's Eryngo, Eryngium heterophyllum
- Wright's Phaseolus, Phaseolus filiformis
- Wright's Silktassel, Garrya wrightii
- Wright's Thelypody, Thelypodium wrightii
- Wright’s Thimblehead, Hymenothrix wrightii
- Wolfberry, Lycium exsertum
- Wolfberry, Lycium fremontii
- Wolfberry, Lycium macrodon
- Wood Sorrel, Oxalis corniculata
- Woody Bottle-washer, Eremothera boothii
- Woods Rose, Rosa woodsi
- Wood's Rose, Rosa woodsi
- Woods' Rose, Rosa woodsi
- Woolly Bluestar, Amsonia tomentosa
- Woolly Bursage, Ambrosia eriocentra
- Woolly Daisy, Eriophyllum wallacei
- Woolly Desert Marigold, Baileya pleniradiata
- Woolly Desert-marigold, Baileya pleniradiata
- Woolly Easterbonnets, Eriophyllum wallacei
- Woolly Fruit Burr Ragweed, Ambrosia eriocentra
- Woolly Indianwheat, Plantago patagonica
- Woolly Mullein, Verbascum thapsus
- Woolly Plantain, Plantago patagonica
- Woolly Plantian, Plantago patagonica
- Woolly Senna, Senna hirsuta var. glaberrima
- Woolly Thistle, Carduus pycnocephalus
- Woolly Wild Sensitive Plant, Senna hirsuta var. glaberrima
- Woolly Wild Sensitive-plant, Senna hirsuta var. glaberrima
- Woolly Tidestromia, Tidestromia lanuginosa
- Wooly Bursage, Ambrosia eriocentra
- Wooly Eriophyllum, Eriophyllum lanosum
- Wooly Indianwheat, Plantago patagonica
- Wooly Plantain, Plantago patagonica
- Wooly Sunflower, Eriophyllum pringlei
- Wooly Tidestromia, Tidestromia lanuginosa
- Xantus Pincushion, Chaenactis xantiana
- Xantu's Pincushion, Chaenactis xantiana
- Yarrow, Achillea millefolium
- Yellow Bird of Paradise, Caesalpinia gilliesii
- Yellow Blanket Flower, Gaillardia pinnatifida
- Yellow Buckwheat, Eriogonum fasciculatum
- Yellow Butterfly Vine, Callaeum macropterum
- Yellow Cockspur, Centaurea solstitialis
- Yellow Columbine, Aquilegia chrysantha
- Yellow Cups, Chylismia brevipes
- Yellow Desert Evening Primrose, Oenothera primiveris
- Yellow Desert Primrose, Oenothera primiveris
- Yellow Elder, Tecoma stans
- Yellow Gaillardia, Gaillardia pinnatifid
- Yellow Goat’s Beard, Tragopogon dubius
- Yellow Melilot, Melilotus officinalis
- Yellow Nightshade Groundcherry, Physalis crassifolia
- Yellow Oxalis, Oxalis corniculata
- Yellow Paloverde, Parkinsonia microphylla
- Yellow Rayed Layia, Layia glandulosa
- Yellow Salsify, Tragopogon dubius
- Yellow Star Thistle, Centaurea solstitialis
- Yellow Starthistle, Centaurea solstitialis
- Yellow Star-thistle, Centaurea solstitialis
- Yellow Sweet-clover, Melilotus officinalis
- Yellow Tackstem, Calycoseris parryi
- Yellow Tansy Mustard, Descurainia pinnata
- Yellow Toadflax, Linaria vulgaris
- Yellow Top, Gutierrezia sarothrae
- Yellow Trumpet, Eriogonum trichopes
- Yellow Trumpet Bush, Tecoma stans
- Yellow Trumpet-flower, Tecoma stans
- Yellow Trumpetbush, Tecoma stans
- Yellow Whispering Bells, Emmenanthe penduliflora
- Yellow Woodsorrel, Oxalis stricta
- Yellow Wood Sorrel, Oxalis corniculata
- Yellowspine Thistle, Cirsium ochrocentrum
- Yellow Top, Gutierrezia sarothrae
- Yellow-flower Desert Evening-primrose, Oenothera primiveris
- Yerba de Pasmo, Baccharis pteronioides
- Yerba de Tago, Eclipta prostrata
- Yerba de Tajo, Eclipta prostrata
- Yerba del Venado, Porophyllum gracile
- Yerba Mansa, Anemopsis californica
- Yerba Santa, Eriodictyon angustifolium
- Yerba-mansa, Anemopsis californica
- Yuma Desert Holly, Atriplex hymenelytra
- Yuma Sandmat, Chamaesyce setiloba
- Yuma Spurge, Chamaesyce setiloba
- Zauschneria, Epilobium canum
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