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

Draba porsildii G. Mulligan
Porsild's draba (Porsild's whitlow-grass)
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #21007)

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Distribution of Draba porsildii
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Species Information

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Tufted perennial herb from a taproot; stems 2-6.5 cm tall, glabrous to sparsely hairy.
Usually all basal, oblanceolate, 0.3-1.2 cm long, 1.5-2 mm wide, hairy with simple, branched, crosslike, and starlike (5-8 rays) hairs, entire; stem leaves lacking or sometimes 1.
Racemes 3- to 6-flowered; petals white, 2-3 mm long; sepals 1.5-2 mm long.
Silicles, 4-8 mm long, 2-3 mm wide, egg-shaped, glabrous; fruiting stalks shorter than silicles; styles 0.25 mm long; seeds 5-9, about 1 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry talus slopes, scree slopes and cliffs in the subalpine and alpine zones; rare in NE and SE BC; N to AK, S YT and W NT and E to SW AB.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Draba porsildii

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) 2077 2300 2615
Slope Gradient (%) 0 6 15
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
180 267 355
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 2 3
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(1), IMA(2)


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.

Taxonomic and Nomenclatural Links

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General References