Dryas integrifolia Vahl
entire-leaved mountain-avens (entireleaf mountain-avens; entire-leaved white mountain-avens)
Rosaceae (Rose family)
Introduction to Vascular Plants
entire-leaved mountain-avens (entireleaf mountain-avens; entire-leaved white mountain-avens)
Rosaceae (Rose family)
Introduction to Vascular Plants
SUBTAXA PRESENT IN BC
Species Information
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
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)
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) |
1622 | 5 | 2440 |
| Slope
Gradient (%) |
24 | 0 | 100 |
|
Aspect (degrees) |
241 | 0 | 360 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 0 | 6 |
| Modal
Nutrient Regime
Class |
C | ||
| #
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) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and 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.Synonyms
Synonyms and Alternate Names:
Dryas integrifolia var. subintegrifolia Hultén
Dryas sylvatica (Hultén) A.E. Porsild