Draba praealta Greene
tall draba (tall whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
tall draba (tall whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Species Information
General:
Biennial or short-lived perennial or occasionally annual herb from a slender taproot; stems simple or branched, 10-30 cm tall, hairy with simple, branched, or starlike hairs.
Leaves:
Mostly basal, in a rosette, oblanceolate, 5-30 mm long, 2-6 mm wide; stem leaves 1-6, lanceolate to egg-shaped, 0.5-3 cm long, 2-14 mm wide, entire to few toothed, hairy with 4- to 7-rayed hairs, usually mixed with branched or simple hairs.
Flowers:
Racemes 5- to 30-flowered, elongate in fruit; flower stalks 3-10 mm long, ascending, with starlike or branched hairs; petals white, sometimes creamy yellow, 2-3.5 mm long; sepals 1.5-2 mm long, soft-hairy.
Fruits:
Silicles, 7-14 mm long, 1.5-2.5 mm wide, narrowly-lanceolate, plane, soft-hairy with simple and branched hairs; styles 0.1-0.2 mm long; seeds 20-70, about 0.8 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 praealta
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) |
1651 | 800 | 2133 |
| Slope
Gradient (%) |
36 | 0 | 75 |
|
Aspect (degrees) |
187 | 80 | 225 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
2 | 1 | 4 |
| Modal
Nutrient Regime
Class |
C | ||
| #
of field plots species was recorded in: |
8 | ||
| Modal
BEC Zone Class |
AT | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
AT(2), BAFA(1), BG(1), ESSF(1), MS(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Moist to mesic forests, meadows and rocky slopes in the montane and subalpine zones; infrequent in S BC east of the Coast-Cascade Mountains, rare northward; N to AK, YT and NT, E to AB and S to WY, NV and OR.Status Information
Synonyms
Synonyms and Alternate Names:
Draba cascadensis Payson & H. St. John