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

Introduction to Vascular Plants

Photograph

© Alfred Cook     (Photo ID #8616)


Map

E-Flora BC Static Map

Distribution of Geum rossii
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SUBTAXA PRESENT IN BC

Geum rossii var. rossii

Species Information

General:
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.
Leaves:
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.
Flowers:
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.
Fruits:
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.

SourceThe Illustrated Flora of British Columbia

Ecology

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

Avg

Min

Max

Elevation (metres)
648 648 648
Slope Gradient (%)
65 65 65

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

218 219 219
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Class
B
# of field plots
 species was recorded in:
1
Modal BEC Zone Class
BWBS

All BEC Zones (# of stations/zone) species was recorded in

BWBS(1)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia