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

Draba cana Rydb.
lance-leaved draba (hoary draba; lance-leaved whitlow-grass)
Brassicaceae (Mustard family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #25571)

E-Flora BC Static Map
Distribution of Draba cana
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Species Information

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General:
Loosely tufted perennial herb from a taproot and a simple or branched stem-base; stems branched, erect or decumbent at base, 5-25 cm tall, densely hairy with simple and starlike hairs.
Leaves:
Basal leaves oblanceolate, 1-4 cm long, 1-4 mm wide, usually toothed; stem leaves (3) 5-8 (12), lanceolate, commonly toothed; densely hairy with simple or branched hairs, generally starlike with branches again branched.
Flowers:
Racemes several- to many-flowered, less than 60, usually some in leaf axils; flower stalks 2-9 mm long, appressed, erect, hairy, lower ones often bracted and less than 3 mm; petals white, 3-5 mm long; sepals 1.5-2 mm long, sparsely soft-hairy.
Fruits:
Silicles, 4-12 mm long, 1.5-2.5 mm wide, lanceolate to oblong, commonly twisted; usually densely soft-hairy, the hairs less than 3-branched and also starlike; styles 0.2-0.8 mm long; fruiting racemes usually occupying the top half of the stems.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry meadows, cliffs, rocky slopes and river terraces in the subalpine and alpine zones; frequent in N BC, less frequent southward E of the Coast-Cascade Mountains; circumpolar, N to AK, YT and NT, E to PQ and S to CO, VT and NV; Eurasia, Greenland.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Draba cana

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) 1685 2034 2610
Slope Gradient (%) 3 34 80
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 74 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 4
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
7
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(1), ESSF(3)

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References