Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

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

Cirsium ochrocentrum, Yellowspine Thistle

Trichoptilium incisum, Yellowdome

Yellowdome is a small flowering plant; mostly yellow although pink specimens exist, that has few or no ray florets as in most typical “daisy” type flowers of the Aster family. Trichoptilium incisum Yellowdome or Yellow Dome is a low growing slightly fragrant plant, native to the southwestern United States. The plants grow up to 10 inches or so and at least ½ of the height consists of the flowering stalk. Trichoptilium incisum Yellowdome phyllaries are linear-elliptic with pointed upper tips and are displayed in 2 equal series. In the southwestern United States, Yellowdome blooms from January to May and again in the fall following sufficient rainfall. Trichoptilium incisum Yellowdome leaves are green, tomentose; alternate or more or less opposite. Plants have both basal and cauline leaves often clustered in lower ½ of plant; mostly sessile; shape sharply dentate or shallowly lobed; leaf surfaces resin-dotted. Trichoptilium incisum Yellowdome is a slightly fragrant low growing plant that, because of its whitish and wholly appearance it superficially resembles Desert Marigold, Baileya multiradiata. Trichoptilium incisum

Scientific Name: Trichoptilium incisum
Common Name: Yellowdome
Also Called: Yellow dome, Yellowhead
Family: Asteraceae, Sunflower Family
Synonyms: ()
Status: Native.
Duration: Annual or short-lived perennial.
Size: Up to 10 inches or so.
Growth Form: Forb/herb; plants mostly tomentose; 1 or many stems from base.
Leaves: Green; tomentose; alternate or more or less opposite; both basal and cauline; leaves often clustered in lower ½ of plant; mostly sessile; shape sharply dentate or shallowly lobed; leaf surfaces resin-dotted.
Flower Color: Yellow, some pink; solitary flowers heads are mostly discoid, some with ray florets; long peduncles up to 4 inches or more; flowering stalks glandular-puberulent; note in the photo above the phyllaries are linear-elliptic with pointed upper tips, the phyllaries are in 2 equal series.
Flowering Season: February to May, again in fall following sufficient rainfall; January to May and October to December in California.
Elevation: Up to 2,500 feet; below 4,500 in California.

Habitat Preferences: Sandy or gravelly soils, mesas and slopes.

Recorded Range: Yellowdome is found in the southwestern United States centered around the states of AZ, CA, NV. In Arizona it is found mostly in the western ½, central and southwestern parts of the state; in California it is found in the southeastern parts of the state and in Nevada it is found in the southeastern parts of the state. It is also native to Baja California and northwestern Mexico.

North America & US County Distribution Map for Trichoptilium incisum.

U.S. Weed Information: No information available.
Invasive/Noxious Weed Information: No information available.
Wetland Indicator: No information available.
Threatened/Endangered Information: No information available.

Genus Information: In North America there are 1 species and 1 accepted taxa overall for Trichoptilium. World wide, The Plant List includes 1 accepted species names and a further 0 infraspecific rank for the genus.

In the Southwestern United States this is 1 species of Trichoptilium. All data is approximate and subject to taxonomic changes.

Comments: Trichoptilium incisum is a slightly fragrant low growing plant that, because of its whitish and wholly appearance it superficially resembles Desert Marigold, Baileya multiradiata.

In Southwestern Desert Flora also see Desert Marigold, Baileya multiradiata and Woolly Desert Marigold, Baileya pleniradiata.

Date Profile Completed: 04/05/2017, updated format 10/11/2017
References:
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, 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 04/05/2017)
https://plants.usda.gov/java/ClassificationServlet?source=profile&symbol=TRICH8&display=31
The Plant List (2013). Version 1.1. Published on the Internet; http://www.theplantlist.org/ (accessed 04/05/2017).
http://www.theplantlist.org/1.1/browse/A/Compositae/Trichoptilium/
Native Plant Information Network, NPIN (2013). Published on the Internet http://www.wildflower.org/plants/ [accessed: 04/05/2017]. Lady Bird Johnson Wildflower Center at The University of Texas, Austin, TX.
http://www.wildflower.org/plants/result.php?id_plant=TRIN2
John L. Strother, FNA; FNA Vol. 21 Page 415, 418, 456; | Asteraceae | 1. Trichoptilium incisum (A. Gray) A. Gray in W. H. Emory, Rep. U.S. Mex. Bound; Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford.
The Jepson Desert Manual; 2002; Baldwin, Bruce G., et. al.; The Jepson Desert Manual: Vascular Plants of Southeastern California; page 188, 193 Univ. of California Press, Berkeley and Los Angeles, California
David J. Keil 2017. Trichoptilium incisum, in Jepson Flora Project (eds.) Jepson eFlora,
http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=5455, accessed on April 05, 2017.
SEINet synonyms, scientific names, geographic locations, general information - (accessed 04/05/2017).
http://swbiodiversity.org/seinet/