Agoseris heterophylla, Annual Agoseris
Scientific Name: Agoseris heterophylla
Common Name: Annual Agoseris
Also Called: Annual Goatsbeard, Mountain Dandelion
Family: Asteraceae, Sunflower Family
Synonyms: (Troximon chilense, Troximon heterophyllum)
Size: Up to 16 inches in form of a flowering stalk (peduncle) or scape.
Growth Form: Forb/herb; erect, small dandelion-like plant covered in small white-hairy pubescence; milky sap.
Leaves: Light green or greenish-whitish, basal rosette leaves, about 6 inches long and narrow, about ½ inch wide, leaf shape variable, narrow, oblanceolate; margins entire, dentate or pinnatifid; variable white-hairy pubescence overall.
Flower Color: Yellow; ligulate florets only, heads solitary borne on single erect stem, several stems from the base; phyllaries are green or rosy-purple (except the margins), and sometimes darker spotted and/or tipped, phyllaries are lanceolate to obovate, glabrous or pubescent; fruit is an achene, pappus of white bristles like a dandelion.
Flowering Season: March to May.
Elevation: 2,500 to 5,000 feet.
Habitat Preferences: Open areas in higher elevations, drier habitats in the plains, mesas and canyons in Arizona.
Recorded Range: Agoseris glauca is found in the western United States and British Columbia: In the United States in AZ, CA, CO, ID, MT, NM, NV, OR, UT and WA.
North America & US County Distribution Map for Agoseris heterophylla.
U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.
Genus Information: In North America there are 10 species and 10 accepted taxa overall for Agoseris. World wide, The Plant List includes 15 accepted species names and includes a further 72 of infraspecific rank for the genus. Common names for this genus are Mountain Dandelion and False Dandelion.
In the Southwestern United States: Arizona and New Mexico each have 3 species of Agoseris, California has 7 species, Nevada has 6 species, Texas has 0 species, Utah has 5 species. All data is approximate and subject to taxonomic changes.
Comments: Annual Agoseris is not a desert species. It belongs to a small genus of plants with rosette leaves and resembling the common dandelion with their similar yellow flowers and puff ball seed heads. Adding to confusion are the common names for Agoseris such as Mountain- and False-Dandelion. (See Common Dandelion, Taraxacum officinale.
Annual Agoseris is one of three species of Agoseris native to Arizona which also includes Pale Agoseris, Agoseris glauca, and Orange Agoseris, Agoseris aurantiaca.