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

Draba incerta Payson
Yellowstone draba (Yellowstone whitlow-grass)
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Kevin deBoer  Email the photographer   (Photo ID #26700)

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Distribution of Draba incerta
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Species Information

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Tufted perennial herb from a taproot and a usually much branched stem-base; stems erect, 2-20 cm tall, starlike-hairy.
All basal, narrowly oblanceolate, 0.7-1.5 cm long, 1-4 mm wide, hairy with stalked, 4-rayed, starlike hairs, the hairs again branched; margins hairy-fringed with branched or starlike hairs; midribs somewhat persistent as threadlike processes; stem leaves absent except on new shoots.
Racemes 3- to 15-flowered; petals yellow, 4-5.5 mm long; sepals 2.5-3.5 mm long, sparsely soft-hairy.
Silicles, 6-10 mm long, 2.5-3.5 mm wide, lanceolate to egg-shaped, plane, hairy to nearly glabrous or glabrous; lowest fruiting stalks 4-18 mm long, ususally twice the length of the silicles, ascending, starlike-hairy; styles 0.4-1 mm long; seeds 8-14, 1.2-1.5 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry meadows, cliffs, fellfields and scree slopes in the upper montane, subalpine, and alpine zones; common throughout BC E of the Coast-Cascade Mountains; N to AK and YT, E to AB and S to WA, ID, MT and WY, disjunct in PQ.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Draba incerta

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) 1370 2219 2608
Slope Gradient (%) 0 37 92
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
12 229 330
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
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(25), BAFA(8), ESSF(11), IMA(4), MS(1), SWB(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.

Taxonomic and Nomenclatural Links

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General References