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

Draba crassifolia Graham
Rocky Mountain draba (Rocky Mountain whitlow-grass; snowbed draba)
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #21004)

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Distribution of Draba crassifolia
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Species Information

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Biennial or perennial herb from a taproot and a simple or branched stem-base; stems branched, erect, 2-12 cm tall, usually glabrous.
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.
Racemes 2- to 15-flowered, open; petals yellow, 1.5-2 mm long; sepals 1-1.5 mm long, glabrous.
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.

Source: The Illustrated Flora of British Columbia

Habitat / 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.

Source: The Illustrated Flora of British Columbia


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)

Site Information
Value / Class




Elevation (metres) 610 1992 2410
Slope Gradient (%) 0 26 67
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
45 282 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 2 6
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: AT(4), BAFA(1), BG(1)


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

Draba crassifolia var. typica C.L. Hitchc.
Draba parryi Rydb.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References