Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Cirsium mohavense, Mojave Thistle

Mojave Thistle has a variety of flora colors from white to pink to lavender. The flowering inflorescence is a spreading array of 1 to many heads, occasionally on short axillary branches. The bracts around the heads are and cob webby as noted in the lower portion of the bracts in the photo. Cirsium mohavense Mojave Thistle is a native thistle that attracts a wide variety of bees, butterflies and other wildlife such as nectar seeking hummingbirds. The seeds are readily eaten by small mammals. Cirsium mohavense Mojave Thistle blooms from June to October and prefers elevations from 800 to 7,000 feet (250- 2,200 m). Habitat preferences include wet or damp soils, streams and dry streams, springs, canyons, and some are found in meadows in desert woodland areas. Cirsium mohavense Mojave Thistle also call Virgin Thistle has green leaves up to 24 inches (60 cm) at the base of the plant that alternate along the stem. The overall shape is oblong-elliptic to oblanceolate, the leaves are toothed and deeply lobed; main spines are slender to stout. Cirsium mohavense Mojave Thistle is somewhat salt-tolerant and primarily found in Mojave Desert ecosystems. It is also found in the southern areas of the Great Basin Desert and other nearby regions of California, Nevada, western Arizona, and southwestern Utah. Cirsium mohavense

Scientific Name: Cirsium mohavense
Common Name: Mojave Thistle

Also Called: Virgin Thistle

Family: Asteraceae, Sunflower Family

Synonyms: (Cirsium virginense)

Status: Native

Duration: Biennial or perennial

Size: 1 to 8 feet (30-250 cm) tall.

Growth Form: Forb/herb; 1 or many stems, erect, the stems are densely woolly and the stem branches and spreads near the top.

Leaves: Green, leaves up to 24 inches (60 cm) at the base of the plant; alternate along stem; shape oblong-elliptic to oblanceolate, the leaves are toothed and deeply lobed; main spines are slender to stout.

Flower Color: White, pink or lavender; inflorescence a spreading array of clusters of 1 to many floral heads; occasionally on short axillary branches; spiny phyllaries, phyllary margins arachnoid to glabrate, outer phyllaries lanceolate or ovate; fruit a cypsela which is often mistaken for an achene.

Flowering Season: June to October

Elevation: 800 to 7,000 feet (250- 2,200 m)

Habitat Preferences: Wet or damp soils, streams and dry streams, springs, canyons, and some are found in meadows in desert woodland areas.

Recorded Range: Mojave Thistle is native to the southwestern United States: AZ, CA, NV, UT.

North America & US County Distribution Map for Cirsium mohavense.

U.S. Weed Information: Unknown

Invasive/Noxious Weed Information: In North America the genus Cirsium is listed as a Noxious Weed by the States of Arkansas and Iowa. Plants included here are invasive or noxious. ∗ See Comments section below.

Wetland Indicator: In North America Cirsium mohavense is a Facultative Upland (FACU) species; usually occur in non-wetlands, but may occur in wetlands; Arid West and Western Mountains, Valleys, and Coast.

Threatened/Endangered Information: Unknown

Genus Information: In North America there are 91 species for Cirsium. Worldwide, The Plant List includes 481 accepted species names and a further 812 scientific names of infraspecific rank for the genus. The genus Cirsium was published by Philip Miller in 1754.

In the Southwestern United States: Arizona and New Mexico each have 19 species of genus, California has 27 species, Nevada has 16 species, Texas has 12 species, Utah has 23 species. All data approximate and subject to revision.

Comments: Mojave Thistle is somewhat salt-tolerant and primarily found in Mojave Desert ecosystems. This species is also found in the southern areas of the Great Basin Desert and other nearby regions of California, Nevada, western Arizona, and southwestern Utah.

∗The genus Cirsium has received adverse notoriety because of the introduction of two thistles native to Europe and now widespread throughout North America. The Canadian Thistle, Cirsium arvense and and the Bull Thistle, Cirsium vulgare are both listed as noxious primarily by agricultural interests.

Most southwestern native thistles, including Mojave Thistle, are non-aggressive; non-invasive and beneficial as pollinators that have evolved to thrive without becoming weedy. Many native thistles are now threatened with some species at risk of extinction.

In Southwest Desert Flora also see: Arizona Thistle, Cirsium arizonicum, Graham's Thistle, Cirsium grahamii, New Mexico Thistle, Cirsium neomexicanum and Yellowspine Thistle, Cirsium ochrocentrum.

Importance to Wildlife, Birds and Livestock
Thistles of the genus Cirsium are regularly visited by many wildlife species such as small mammals, hummingbirds and nectar-feeding bats. Also the seeds are attractive to small mammals and finches such as American goldfinch.

Special Value to Native Bees, Butterflies and Insects
Thistles of the genus Cirsium are important as a group as they are frequently visited by pollinators such as Native bees, bumblebees and a very large numbers of insects and butterflies. "Monarch butterflies visit native thistle flowers more than any other wildflowers in some regions during their migration back to Mexico". They are also heavily used as food plants by the larvae of some Lepidoptera (butterfly) species. In addition to food Cirsium also provides nesting material and structure for Native bees and other insects.

To find out more about Butterflies and Moths of North America visit BAMONA.
For excellent information on invertebrate conservation visit The Xerces Society.

Etymology:
The genus Cirsium is derived from the Greek words kirsion "a kind of thistle" in turn from kirsos, "a swollen vein or welt," as thistles are used as a remedy for such issues. The genus Cirsium was published by Philip Miller in 1754.

The species epithet "mohavense" is a reference to the Mojave Desert, the epicenter of its distribution.

Ethnobotany
Unknown

Date Profile Completed: 02/07/2020
References:
Kearney, Thomas H., Peebles, Robert H., 1960, Arizona Flora, University of California Press, Berkley and Los Angeles, California.
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search - (accessed 02/06/2020)
https://plants.usda.gov/java/nameSearch (for Cirsium)
https://plants.usda.gov/java/stateSearch (for Cirsium)
The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ (accessed 02/06/2020).
http://www.theplantlist.org/1.1/browse/A/Compositae/Cirsium/
Native Plant Information Network, NPIN (2013). Published on the Internet http://www.wildflower.org/plants/ (accessed 02/06/2020). Lady Bird Johnson Wildflower Center at The University of Texas, Austin, TX.
https://www.wildflower.org/plants/result.php?id_plant=CIMO
David J. Keil 2012, Cirsium mohavense, in Jepson Flora Project (eds.) Jepson eFlora, /eflora/eflora_display.php?tid=2198, accessed on February 06, 2020.
https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=2198
David J. Keil,FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Cirsium ; 37. Cirsium mohavense, 31: 68. 1911.; Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford.
'Cirsium mohavense', Wikipedia, The Free Encyclopedia, 24 October 2018, 08:48 UTC,
https://en.wikipedia.org/w/index.php?title=Cirsium_mohavense&oldid=865495091 [accessed 6 February 2020]
'Cirsium', Wikipedia, The Free Encyclopedia, 25 January 2020, 15:17 UTC,
https://en.wikipedia.org/w/index.php?title=Cirsium&oldid=937520470 [accessed 7 February 2020]
SEINet synonyms, scientific names, geographic locations, general information.
http://swbiodiversity.org/seinet/
Etymology:Michael L. Charters California Plant Names: Latin and Greek Meanings and Derivations; A Dictionary of Botanical and Biographical Etymology - (accessed 02/06/2020)
http://www.calflora.net/botanicalnames/pageCI-CY.html