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

Draba ruaxes Payson & H. St. John
coast mountain draba (coast mountain whitlow-grass; Rainier draba)
Brassicaceae (Mustard family)

Introduction to Vascular Plants
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Distribution of Draba ruaxes
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Species Information

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General:
Tufted perennial herb from a taproot and a branched stem-base, often clothed with dried remains of old leaves; stems 2-10 cm tall, hairy with simple and branched hairs.
Leaves:
All basal, egg-shaped to elliptic or oblanceolate, 5-12 mm long, 2-4 mm wide, hairy with long-stalked, starlike hairs on lower surface, long, simple and few-branched hairs on upper; stem leaves lacking.
Flowers:
Racemes short, 3- to 10-flowered; petals yellow, 4-5 mm long.
Fruits:
Silicles, 5-8 mm long, 3.5-5.5 mm wide, oval to egg-shaped, plane, glabrous to densely soft-hairy with simple and branched hairs; fruiting stalks almost as long as silicles; styles 0.6-1.2 mm long; seeds 10-16, 1.5-2 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry meadows, cliffs, rocky slopes and scree slopes in the subalpine and alpine zones; rare in the Coast-Cascade Mountains; N to AK and YT and S to N WA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Draba ruaxes

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) 39 39 39
Slope Gradient (%) 23 23 23
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
238 237 238
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Class
A
Number of field plots
 species was recorded in:
1
Modal BEC Zone Class
BAFA
All BEC Zones (# of stations/zone) species was recorded in: BAFA(1)

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

Draba exalata Ekman
Draba ventosa var. ruaxes (Payson & H. St. John) C.L. Hitchc.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References