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

Introduction to Vascular Plants


© Moralea Milne     (Photo ID #11623)


E-Flora BC Static Map

Distribution of Agoseris grandiflora
Click here to view the full interactive map and legend

Species Information

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

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

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


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)
389 120 915
Slope Gradient (%)
48 4 100

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

199 45 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 1 2
Modal Nutrient Regime
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Agoseris grandiflora var. leptophylla G.I. Baird
Agoseris laciniata (Nutt.) Greene
Agoseris plebeja (Greene) Greene
Troximon grandiflorum Nutt.