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

Distribution of Agoseris grandiflora
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SUBTAXA PRESENT IN BC

Agoseris grandiflora var. leptophylla

Species Information

Click on the image below to view an expanded illustration for this species.

Illustration Source: The Illustrated Flora of British Columbia

General:
Perennial from a branched base; stems leafless, exuding milky juice when broken, 20-70 cm tall.

Leaves:
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.

Flowers:
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.

Fruits:
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:
Yellow

Blooming Period:
Spring

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

Ecology

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
Site Information	Minimum	Average	Maximum
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 Class	C
Number of field plots species was recorded in:	25
Modal BEC Zone Class	CDF
All BEC Zones (# of stations/zone) species was recorded in:	CDF(6), CWH(3), ICH(1), IDF(1)
Source: Klinkenberg 2020

Climate

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.

Status Information

Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Native	S5	Yellow	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer, the authoritative source for conservation information in British Columbia.

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

Flora North America treatment for Asteraceae
Flora North America treatment for Agoseris grandiflora
Genetic information (NCBI Taxonomy Database)
International Plant Names Index
Taxonomic Information from the World Flora Online
Integrated Taxonomic Information System

Additional Range and Status Information Links

Burke Museum of Natural History (Washington State records)
CalFlora
Consortium of Pacific Northwest Herbaria records
Jepson Interchange
NatureServe Explorer
USDA

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
Google Image Search
Flickr Image Search

General References

Google Scholar Search
Family References
General Botanical References for BC

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-05-11 9:01:02 AM ]

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