Draba densifolia Nutt.
Nuttall's draba (denseleaf draba; Nuttall's whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Nuttall's draba (denseleaf draba; Nuttall's whitlow-grass)
Brassicaceae (Mustard family)
Introduction to Vascular Plants
Species Information
General:
Tufted perennial herb from a taproot and a usually branched stem-base; stems erect, 0.5-15 cm tall, glabrous to hairy with simple and branched hairs.
Leaves:
All basal, linear to linear-oblanceolate, 0.2-1.2 (1.9) cm long, 0.5-3 mm wide, upper surface usually glabrous, lower leaf surfaces mainly with simple to 3-branched hairs, margins hairy-fringed with stiff simple hairs, 0.5-1 mm long; stem leaves lacking.
Flowers:
Racemes 3- to 15-flowered; flower stalks 2-5 mm long, hairy; petals yellow, 2-6 mm long; sepals 2-2.5 mm long, soft-hairy.
Fruits:
Silicles, 2-7 mm long, 2-3.5 mm wide, egg-shaped to elliptic, plane; hairy or glabrous; styles 0.5-1 mm long; seeds 2-12, about 2 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 densifolia
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) |
2096 | 990 | 2659 |
| Slope
Gradient (%) |
31 | 1 | 55 |
|
Aspect (degrees) |
206 | 10 | 272 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
1 | 0 | 4 |
| Modal
Nutrient Regime
Class |
C | ||
| #
of field plots species was recorded in: |
10 | ||
| Modal
BEC Zone Class |
ESSF | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
AT(2), ESSF(5), IDF(1), IMA(1), MS(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Mesic to dry forest openings, meadows, rocky slopes and cliffs from the upper montane to alpine zones; rare in SC, WC and SE BC; E to SW AB, S to WY, VT and CA, disjunct in AK.Status Information
Synonyms
Synonyms and Alternate Names:
Draba caeruleomontana Payson & H. St. John
Draba nelsonii J.F. Macbr. & Payson
Draba sphaerula J.F. Macbr. & Payson