E-Flora BC: Electronic Atlas of the Flora of British Columbia

Agoseris heterophylla (Nutt.) Greene
Annual False Dandelion (annual agoseris)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Rosemary Taylor  Email the photographer   (Photo ID #24654)

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Distribution of Agoseris heterophylla
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Agoseris heterophylla ssp. heterophylla

Species Information

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Annual from a fibrous root; stems leafless, solitary to more often several, exuding milky juice when broken, 3-45 cm tall.
Mainly basal, oblanceolate to occasionally linear or lanceolate, entire to toothed or pinnatifid, 1-15 cm long, 0.1-1.5 cm wide.
Heads with strap-shaped flowers, solitary; involucres narrowly bell-shaped to rounded, 5-22 mm tall; involucral bracts in 1-2 series, lanceolate, abruptly sharp-pointed to attenuate, more or less long-hairy with septate, twisted hairlike growths, some of these purplish due to purplish cross-walls in the hairs; receptacles naked; ray flowers yellow, commonly pinkish upon drying.
Achenes several-ribbed or slightly winged, spindle-shaped, the body about 1-5 mm long, tapering to a slender beak about 2-3.5 times as long as the body; pappus of numerous hairlike bristles, 4-7 mm long, white.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry grassy slopes, meadows and grasslands in the lowland, steppe and lower montane zones; frequent in extreme S BC; S to ID, UT, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Agoseris heterophylla

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 152 1058 2286
Slope Gradient (%) 0 26 77
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
60 177 240
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 1 3
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: AT(2), ICH(2), IDF(1), PP(3)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References