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

Dryas hookeriana L.(Juz.) Hulten
white mountain-avens
Rosaceae (Rose family)

Introduction to Vascular Plants

© Ken Marr  Email the photographer   (Photo ID #88073)

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Distribution of Dryas hookeriana
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Species Information

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Prostrate shrub from a woody stem-base; stems trailing, freely branching and rooting, forming dense mats.
Alternate, evergreen, the leaf blades oblong-egg-shaped to linear-lanceolate, 0.8-4 cm long, broadest near the middle, blunt to rounded at the tip, rounded to squared-off or somewhat heart-shaped at the stalked base; the margins coarsely blunt-toothed, rolled under; strongly wrinkled, green and mostly smooth but often warty-glandular above, densely white woolly-hairy (rarely nearly smooth) below; midvein below with gland-tipped brown hairs and/or brown scales with long much-branched white hairs; dead leaves withering but the remains persisting.
Solitary, erect on leafless, 5- to 20-cm tall stalks, the stalks more or less woolly and also stalked-glandular above; corollas white, 2-3 cm across, the petals 8 to 10, oblong to elliptic, spreading, 8-17 mm long; calyces white-woolly and with some black, glandular hairs, the 8 to 10 lobes oblong-lanceolate, 4-8 mm long; ovaries superior; stamens numerous, the filaments smooth.
Achenes, numerous, about 3 mm long, with long (to 3 or 4 cm), feathery styles.
Hybrids between this species and Dryas integrifolia can occur where the two species grow together. To separate this species from D. octopetala look for egg-shaped leaves, broadest near or below middle; densely white-woolly beneath.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry to mesic gravelly slopes and ridgecrests, rocky tundra and heath in the alpine zone; ssp. alaskensis is rare in C BC while the ssp. octopetala and ssp. hookeriana are infrequent in S BC but more common northward; circumboreal, N to AK, YT and NT, S to OR and CO and E to NF.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Dryas hookeriana

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) 2040 2170 2300
Slope Gradient (%) 50 51 52
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
76 143 212
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 3 3
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: ESSF(1), IMA(1)

Synonyms and Alternate Names

Dryas octopetala subsp. hookeriana (Juz.) Hultén

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References