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

Agoseris grandiflora (Nutt.) Greene
large-flowered agoseris (bigflower agoseris)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Moralea Milne  Email the photographer   (Photo ID #11623)

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Distribution of Agoseris grandiflora
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Agoseris grandiflora var. leptophylla

Species Information

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Perennial from a branched base; stems leafless, exuding milky juice when broken, 20-70 cm tall.
All basal, oblanceolate to lance-elliptic or broadly linear, entire to deeply pinnately cut with broad or narrow lobes which are widely spreading or pointed towards the base, 10-25 cm long, 1-3 cm wide.
Heads with strap-shaped flowers, solitary, large; involucres broadly bell-shaped to rounded, 1.5-4 cm tall; involucral bracts in 4-5 series, the outer relatively broad and short, conspicuously fringed with small hairs; receptacles naked; flowers yellow, often turning pinkish or purplish upon drying.
Achenes smooth, spindle-shaped, the body about 4-7 mm long, tapering to a smooth, slender beak 2-4 times as long as the body; pappus of numerous hairlike bristles, 8-14 mm long, white. vol1_3

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Mesic to dry grassy slopes, meadows and forest openings from the lowland to the lower montane zones; infrequent in extreme S BC; S to UT, NV and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Agoseris grandiflora

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) 120 389 915
Slope Gradient (%) 4 48 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 199 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 1 2
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: CDF(6), CWH(3), ICH(1), IDF(1)


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.

Synonyms and Alternate Names

Agoseris grandiflora var. leptophylla G.I. Baird
Agoseris laciniata (Nutt.) Greene
Agoseris plebeja (Greene) Greene
Troximon grandiflorum Nutt.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References