Draba aurea |
Draba incerta |
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golden draba whitlow-grass |
whitlow-wort, Yellowstone draba whitlow-wort |
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Habit | Perennials not forming clumps; base unbranched or branched; stems typically 1-3.5 dm, occasionally branched distally, pubescent with simple trichomes and 3-6-rayed trichomes. | Loosely tufted, scapose perennial, the scapes 1-20 cm. long, often with 1 bract, pubescent with stellate and irregularly branched hairs. |
Leaves | Basal leaves forming rosettes, petioles ciliate with simple trichomes to 0.8 mm, blades narrower toward base, 1-3.7 cm long and 2-7 mm broad, margins entire or finely toothed, pubescent above and beneath, stalked trichomes with up to 8 rays, 0.2-0.5 mm; cauline leaves usually 5-20, sessile, ovate to lanceolate or sometimes narrower toward base, margins entire or dentate, pubescent above and beneath, upper surface sometimes with simple trichomes. |
Leaves alternate, somewhat imbricate, linear-oblanceolate, 7-13 mm. long and 1.5-3.5 mm. broad, the margins with simple to branched hairs, the under surface pubescent with irregularly branched hairs, with some branched along both sides of the hair stem. |
Flowers | Inflorescence racemose, generally 18-52 flowered, rarely up to 72 flowered, usually bracteate proximally; rachis rigid, pubescence same as stem; fruiting pedicels spreading-ascending to nearly erect, not curved, 3-13 mm, same pubescence as stem; sepals 4, green to yellowish, oblong, 2.2-3 mm, pubescent with simple and branched trichomes; petals 4, yellow, slender and narrower toward base, 3.5-5 mm long and 1.5-2.5 mm broad; anthers approximately 0.5 mm, ovate. |
Inflorescence racemose; pedicles about equaling the fruit; sepals 4, erect; petals 4, yellow, fading to white, 4-5 mm. long; stamens 6; style 0.4-1 mm. long. |
Fruits | Siliques, 6-17 mm long and 2-3.5 mm broad, often partially appressed to rachis, linear-lanceolate to lanceolate or may be slender and narrower toward base, twisted or plane, flattened; valves pubescent with simple trichomes and 2-4-rayed trichomes on short stalks; ovaries containing 28-38 or more ovules; seeds oblong, 0.9-1.3 mm long and about half as wide. |
Silicles ovate-lanceolate to elliptic, scarcely inflated, 6-10 mm. long and 2.5-3.75 mm. broad, usually pubescent with coarse, short, stiff, simple or branched hairs. |
Draba aurea |
Draba incerta |
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Flowering time | June-August | June-August |
Habitat | Montane forest to alpine ridges or meadows. | Alpine and subalpine slopes. |
Distribution | Occurring east of the Cascades crest in north-central Washington; Alaska to north-central Washington, east to the Rocky Mountains; Greenland.
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Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.
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Origin | Native | Native |
Conservation status | Sensitive in Washington (WANHP) | Not of concern |
Sibling taxa | ||
Web links |
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