Agoseris heterophylla, Annual Agoseris
Scientific Name: Agoseris heterophylla
Common Name: Annual Agoseris
Also Called: Annual Goatsbeard and 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, entire, toothed or pinnatifid; variable white-hairy pubescence overall.
Flower Color: Yellow; ray ligule flowers only, heads solitary borne on single erect stem, several stems from the base, 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: Western United States and British Columbia: In the United States in AZ, CA, CO, ID, MT, NM, NV, OR, UT and WA.
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: Eight species in Agoseris primarily in the western half of North America, and in Michigan and Ontario. Three species in Arizona. Three varieties in Agoseris heterophylla, one variety in Arizona;
Agoseris heterophylla var. heterophylla, Annual Agoseris.
Comments: Anual Agoseris is not a desert species. It belongs to a small genus of basal leaves plants 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.