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

Draba macounii O.E. Schulz
Macoun's draba (Macoun's whitlow-grass)
Brassicaceae (Mustard family)

Introduction to Vascular Plants
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Distribution of Draba macounii
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Species Information

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General:
Tufted perennial herb from a taproot and a branching stem-base; stems 2-3 cm tall, sparsely hairy with simple and branched hairs.
Leaves:
All basal, compacted, oblanceolate, 0.5-1 cm long, 2.5-5 mm wide, hairy with tangled, simple and branched hairs, margins hairy-fringed; stem leaves lacking.
Flowers:
Short racemes 4- to 8-flowered; petals pale yellow, drying white, 3.5-4.5 mm long.
Fruits:
Silicles, 5-7 mm long, about half as wide, oblong-elliptic, glabrous, dark green; fruiting stalks shorter than silicles, spreading; styles less than 1 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry meadows, rocky slopes and scree slopes in the subalpine and alpine zones; infrequent in N BC; N to AK, S YT and SW NT and E to AB.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Draba macounii

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) 1968 2145 2248
Slope Gradient (%) 0 28 60
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W] 		10 296 350
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric] 		0 1 3
Modal Nutrient Regime
Class		 C
Number of field plots
 species was recorded in:		 5
Modal BEC Zone Class
 ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(1), ESSF(4)

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

Flora North America treatment for Brassicaceae
Genetic information (NCBI Taxonomy Database)
 International Plant Names Index
 Taxonomic Information from the World Flora Online
 Integrated Taxonomic Information System

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
 Google Image Search
 Flickr Image Search

General References

Google Scholar Search
Family References
 General Botanical References for BC
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2024-11-16 11:24:59 PM ]
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