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

Dryas octopetala L.
white mountain-avens (eightpetal mountain-avens)
Rosaceae (Rose family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #72716)

E-Flora BC Static Map
Distribution of Dryas octopetala
Click here to view our NEW interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

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



General:
Prostrate shrub from a woody stem-base; stems trailing, freely branching and rooting, forming dense mats.
Leaves:
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.
Flowers:
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.
Fruits:
Achenes, numerous, about 3 mm long, with long (to 3 or 4 cm), feathery styles.
Notes:
Hybrids between this species and Dryas integrifolia can occur where the two species grow together. To separate this species from D. hookeriana look for midvein of underside of leaves with both gland-tipped hairs and white-hairy scales; upper leaf surfaces lacking sticky, unstalked wart-like glands.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
White
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: White
Present from Spring to Summer
Source:  The USDA

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

Ecology

Ecological Framework for Dryas octopetala

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) 604 2128 3000
Slope Gradient (%) 0 26 92
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 242 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
455
Modal BEC Zone Class
AT
All BEC Zones (# of stations/zone) species was recorded in: AT(138), BAFA(103), BWBS(1), ESSF(131), IMA(51), MS(1), SBPS(1), SWB(3)

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 octopetala var. argentea Blytt
Dryas octopetala var. glabrata Hultén
Dryas octopetala var. viscida Hultén
Dryas punctata Juz.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References