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

Dryas integrifolia Vahl
entire-leaved mountain-avens (entireleaf mountain-avens; entire-leaved white mountain-avens)
Rosaceae (Rose family)

Introduction to Vascular Plants

© Virginia Skilton  Email the photographer   (Photo ID #47086)

E-Flora BC Static Map
Distribution of Dryas integrifolia
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Species Information

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General:
Prostrate shrub from a woody stem-base; stems trailing, freely branching and rooting, densely tufted to mat-forming.
Leaves:
Alternate, evergreen, the leaf blades narrowly oblong to lanceolate, 0.8-3 cm long, broadest below the middle, blunt to rounded at the tip, squared-off to heart-shaped at the stalked base; the margins entire or with a few teeth on the lower half, often rolled under; slightly wrinkled to smooth, green and usually smooth above, thinly to densely white woolly-hairy below; midvein not stalked-glandular below; dead leaves withering but the remains persisting.
Flowers:
Solitary, erect on leafless, woolly-hairy, 2- to 15-cm tall stalks; corollas white, 2-3 cm across, the petals 8 to 10, elliptic, spreading, 8-13 mm long; calyces sparsely woolly and with some black, gland-tipped hairs, the 8 to 10 lobes narrowly lanceolate, 4-8 mm long; ovaries superior; stamens numerous, the filaments smooth.
Fruits:
Numerous achenes with long (to 4 cm), feathery styles.
Notes:
Hybrids between this species and Dryas octopetala can occur where the two species grow together. Two subspecies with overlapping ranges occur in BC:

1. Leaf bases wedge-shaped to squared-off; blades flat................ssp. sylvatica (Hult.) Hult.

1. Leaf bases heart-shaped to squared-off; blades with rolled-under margins................... ssp. integrifolia

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to moist tundra, heath, rocky ridges, talus slopes and gravel bars in the montane to alpine zones, frequent in N BC, S to 55degreeN; N to AK and NT, E to NF and S to NH; Greenland.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Dryas integrifolia

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

Minimum

Average

Maximum

Elevation (metres) 5 1622 2440
Slope Gradient (%) 0 24 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 241 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 6
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
318
Modal BEC Zone Class
BAFA
All BEC Zones (# of stations/zone) species was recorded in: AT(2), BAFA(197), BWBS(2), ESSF(46), IMA(1), SWB(58)

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.

Synonyms and Alternate Names

Dryas integrifolia var. subintegrifolia Hultén
Dryas sylvatica (Hultén) A.E. Porsild

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References