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

Agoseris aurantiaca (Hook.) Greene
Orange False Dandelion (orange agoseris)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Judith Holm  Email the photographer   (Photo ID #52388)

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Distribution of Agoseris aurantiaca
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Agoseris aurantiaca var. aurantiaca

Species Information

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Perennial herb from a taproot and a simple or branching base; stems leafless, 1-several, exuding milky juice when broken, 10-60 cm tall.
All basal, extremely variable, narrowly linear-lanceolate to broadly oblanceolate, entire to laciniate or few lobed, 5-35 cm long, 1-30 mm wide, rounded to long-pointed, usually glabrate with sparse hairs along the midrib below, margins usually fringed with small hairs toward the base, the stalks purplish.
Heads with strap-shaped flowers, solitary; involucres top-shaped to narrowly bell-shaped; involucral bracts in about 3 series, slightly or not at all graduated, narrow, long-pointed, the outer series fringed with small hairs, usually glabrous or sometimes long-hairy on the surface; receptacles naked; ray flowers burnt orange, rarely yellow, commonly turning deep pink to purple in drying or with age.
Achenes smooth, 5-9 mm long, rather abruptly narrowed to a beak, which varies from about half to slightly longer than the body; pappus of numerous hairlike bristles, 9-14 mm long, silky white or sordid.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Mesic to dry open forests and meadows in the upper montane to alpine zones; frequent throughout BC; N to YT and NT; E to PQ and S to NM and CA

Source: The Illustrated Flora of British Columbia


Ecological Framework for Agoseris aurantiaca

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) 204 1570 2500
Slope Gradient (%) 0 29 230
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 178 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 8
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(13), BAFA(27), BG(1), BWBS(4), CMA(5), CWH(27), ESSF(134), ICH(2), IDF(9), IMA(5), MH(4), MS(17), PP(1), SBPS(2), SBS(12), SWB(12)


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

Additional Photo Sources

General References