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

Introduction to Vascular Plants

Photograph

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Map

E-Flora BC Static Map

Distribution of Draba ruaxes
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Species Information

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.

SourceThe Illustrated Flora of British Columbia

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.

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

Avg

Min

Max

Elevation (metres)
39 39 39
Slope Gradient (%)
23 23 23

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

237 238 238
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 2
Modal Nutrient Regime
Class
A
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Draba exalata Ekman
Draba ventosa var. ruaxes (Payson & H. St. John) C.L. Hitchc.