Draba crassifolia Graham
Rocky Mountain draba (Rocky Mountain whitlow-grass; snowbed draba)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Rocky Mountain draba (Rocky Mountain whitlow-grass; snowbed draba)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Species Information
General:
Biennial or perennial herb from a taproot and a simple or branched stem-base; stems branched, erect, 2-12 cm tall, usually glabrous.
Leaves:
all basal leaves egg-shaped to oblanceolate, entire to toothed, 0.2-2.5 cm long, 1-6 mm wide, usually glabrous or with a few simple and 2-branched hairs, margins glabrous or hairy-fringed with simple to 2-branched hairs; stem leaves lacking, rarely 1.
Flowers:
Racemes 2- to 15-flowered, open; petals yellow, 1.5-2 mm long; sepals 1-1.5 mm long, glabrous.
Fruits:
Silicles, 4-10 mm long, 1.5-2.5 mm wide, narrowly elliptic to narrowly egg-shaped, plane, glabrous; fruiting stalks 2-6 mm long, generally shorter than silicles, glabrous;styles lacking or up to 0.15 mm long; seeds 10-24, oval, light brown, about 1 mm long.
Illustration
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Ecology
Ecological Framework for Draba crassifolia
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) |
1992 | 610 | 2410 |
| Slope
Gradient (%) |
26 | 0 | 67 |
|
Aspect (degrees) |
282 | 45 | 360 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 1 | 6 |
| Modal
Nutrient Regime
Class |
C | ||
| #
of field plots species was recorded in: |
9 | ||
| Modal
BEC Zone Class |
AT | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
AT(4), BAFA(1), BG(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Mesic to dry meadows and cliffs in the subalpine and alpine zones; infrequent throughout BC E of the Coast-Cascade Mountains; N to AK, YT, and NT, E to PQ and S to CO and AZ.Status Information
Synonyms
Synonyms and Alternate Names:
Draba crassifolia var. typica C.L. Hitchc.
Draba parryi Rydb.