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

Geum rossii (R. Br.) Ser.
Ross' Avens
Rosaceae (Rose family)

Introduction to Vascular Plants

© Alfred Cook  Email the photographer   (Photo ID #8616)

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Distribution of Geum rossii
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Geum rossii var. rossii

Species Information

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Perennial herb from a thick scaly rhizome and stout stem-base covered with remains of old leaves; stems erect, 5-30 cm tall, simple, tufted, sparsely spreading-hairy to long-soft-hairy.
Basal leaves numerous, short-stalked, erect to spreading, interruptedly pinnately divided, 4-12 cm long, the blades elliptic-oblong in outline, with 9 to 31 entire to 3- to 5-toothed main segments, the terminal segment similar to the lateral ones, from nearly smooth and greenish to silvery-silky or silvery-long-hairy; stem leaves alternate, several, much reduced.
Inflorescence of 1 or 2 (to 4) terminal, erect flowers; corollas yellow, wheel-shaped, the petals 5, nearly circular, spreading, 6-12 mm long; calyces often purplish, 5-lobed, the lobes narrowly egg-shaped, 5-10 mm long, alternating with lanceolate bractlets 3-7 mm long; ovaries superior; stamens numerous, about 60.
Achenes, several to many in hemispheric heads; achenes narrowly spindle-shaped, coarse-hairy, the styles persistent, not much elongated, about as long as the achenes, straight, smooth.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic, open calcareous sites in the alpine zone; rare in NW BC, known only from Yehiniko Lake, near Telegraph Creek; amphiberingian, N to AK and NT and S to NV, NM and AZ; E Asia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Geum rossii

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) 648 648 648
Slope Gradient (%) 65 65 65
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
219 218 219
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 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: BWBS(1)

Taxonomic and Nomenclatural Links

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General References