Draba oligosperma Hook.
few-seeded draba (fewseed draba; few-seeded whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
few-seeded draba (fewseed draba; few-seeded whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Species Information
General:
Densely tufted perennial herb from a taproot; stems, branched, 1-10 cm tall, glabrous or starlike-hairy near base.
Leaves:
All basal, narrowly oblanceolate to oblong, 3-12 mm long, 0.7-1.7 mm wide, hairy with 4-rayed, starlike hairs with the rays branched, margins hairy with starlike hairs, starlike hairs on lower leaf surfaces unstalked with mostly 9 or more rays, slightly V-shaped in cross section, midribs prominent and often persistent; stem leaves lacking.
Flowers:
Racemes 3- to 15-flowered; flower stalks 2-10 mm long, ascending, glabrous; petals yellow, 3-5 mm long; sepals 2-2.5 mm long, sparsely soft-hairy.
Fruits:
Silicles, 3-8 mm long, 2-4 mm wide, egg-shaped to lanceolate or oval, plane, glabrous or hairy; styles 0.2-1 mm long; seeds 2-10, 1.4-1.8 mm long.
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.
Illustration Source: The Illustrated Flora of British Columbia
Ecology
Ecological Framework for Draba oligosperma
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)
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) |
1961 | 5 | 2565 |
| Slope
Gradient (%) |
30 | 3 | 85 |
|
Aspect (degrees) |
246 | 27 | 340 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 1 | 5 |
| Modal
Nutrient Regime
Class |
B | ||
| #
of field plots species was recorded in: |
34 | ||
| Modal
BEC Zone Class |
AT | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
AT(13), BAFA(7), ESSF(11), IMA(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Dry rocky slopes, cliffs, meadows, fellfields and scree slopes in the steppe to alpine zones; infrequent in S BC, rare northward; N to AK, YT and NT, E to SW AB and S to WY, CO, NV and CA.Status Information
Synonyms
Synonyms and Alternate Names:
Draba juniperina Dorn
Draba oligosperma subsp. subsessilis (S. Watson) A.E. Murray
Draba oligosperma var. juniperina (Dorn) S.L. Welsh
Draba oligosperma var. oligosperma
Draba oligosperma var. pectinipila (Rollins) C.L. Hitchc.
Draba oligosperma var. subsessilis (S. Watson) O.E. Schulz
Draba pectinipila Rollins
Draba subsessilis S. Watson