Draba aureola |
Draba ramosissima |
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alpine whitlow-grass, golden alpine Draba, golden Draba, great alpine whitlow-grass, Mt. Lassen Draba, Mt. Lassen Draba whitlow-grass, Mt. Lassen whitlow-grass |
branch Draba |
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Habit | Perennials; (short-lived); caudex simple or branched (poorly developed, with persistent dry leaves); not scapose. | Perennials; caudex branched (well-developed, with persistent leaf bases); not scapose. |
Stems | unbranched or branched, 0.3–1.5 dm, hirsute throughout, trichomes simple and long-stalked, 2–4-rayed, 0.2–1.5 mm. |
unbranched proximally, paniculately branched distally, 0.7–3.8(–5) dm, pubescent proximally, trichomes short-stalked, 2–4-rayed, 0.1–0.6 mm, sometimes with simple ones, 0.4–0.8 mm. |
Basal leaves | (forming dense clusters); rosulate; sessile; blade oblanceolate to linear, (0.7–)1–2.5(–3.2) cm × 2–3.5(–5) mm, margins entire, (ciliate, trichomes simple and 2-rayed, 0.5–1.5 mm), surfaces densely hirsute, abaxially with stalked, 3–5-rayed trichomes, 0.1–0.5 mm, adaxially with simple and long-stalked, 2-rayed trichomes, to 1 mm, with smaller, 3–5-rayed ones. |
rosulate; petiolate; petiole (to 2 cm), ciliate (trichomes simple, 0.3–0.5 mm); blade oblanceolate, (0.7–)1–5.5 cm × 2–8 mm, margins dentate, surfaces pubescent with short-stalked to subsessile, 3- or 4-rayed trichomes, 0.1–0.5 mm, adaxially sometimes also simple, 0.4–1.3 mm. |
Cauline leaves | 5–33; sessile; blade oblong to linear, margins entire, surfaces pubescent as basal. |
(5–)7–15(–21); sessile; blade ovate to oblong or elliptic to lanceolate, margins usually coarsely dentate or serrate, rarely subpinnatifid, surfaces pubescent as basal. |
Racemes | 12–83-flowered, ebracteate or proximalmost 1–9 flowers bracteate, slightly or not elongated in fruit; rachis not flexuous, hirsute as stem. |
9–28-flowered, ebracteate, paniculate; rachis not flexuous, pubescent as stem. |
Flowers | sepals ovate, 2.5–4 mm, glabrous; petals bright yellow, linear to linear-oblanceolate, 4–6 × 0.5–1(–1.2) mm; anthers narrowly oblong, 0.8–1 mm. |
sepals oblong, 2.5–3 mm, pubescent, (trichomes simple and subsessile, 2–4-rayed); petals white, spatulate, 4–6 × 1.5–2.5 mm; anthers oblong, 0.5–0.6 mm. |
Fruiting pedicels | horizontal to divaricate, usually straight, rarely curved upward, (3–)5–12(–19) mm, hirsute as stem. |
horizontal to divaricate-ascending, straight, (4–)6–12(–15) mm, pubescent, trichomes 2–4-rayed. |
Fruits | oblong or, rarely, oblong-ovate, plane, flattened, (6–)9–14(–16) × 3–5 mm; valves pubescent, trichomes stalked, 2–4-rayed, 0.07–0.5 mm; ovules 10–20 per ovary; style (0.6–)1–1.6(–2) mm. |
narrowly oblong to elliptic or oblong-lanceolate, often strongly twisted, flattened, 5–11 × 1.5–2.2 mm; valves pubescent, trichomes subsessile or sessile, 2–4-rayed, 0.07–0.3 mm; ovules 4–10(–12) per ovary; style (1)1.5–3(–4) mm, (sparsely pubescent). |
Seeds | oblong, 1.4–1.9 × 0.8–1.1 mm. |
oblong, 1.2–1.8 × 0.6–0.9 mm. |
2n | = 20. |
= 16. |
Draba aureola |
Draba ramosissima |
|
Phenology | Flowering Jul–Aug. | Flowering Apr–Jun. |
Habitat | Open conifer forests, alpine meadows and moraines, talus slopes | Limestone cliffs and outcrops, shale barrens, rocky wooded areas |
Elevation | 2200-3200 m (7200-10500 ft) | 0-1100 m (0-3600 ft) |
Distribution |
CA; OR; WA
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DC; KY; MD; NC; TN; VA; WV |
Discussion | Draba aureola is known from Lassen, Shasta, and Siskiyou counties in California, Deschutes County in Oregon, and Lewis and Pierce counties in Washington. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 7, p. 295. | FNA vol. 7, p. 332. |
Parent taxa | Brassicaceae > tribe Arabideae > Draba | Brassicaceae > tribe Arabideae > Draba |
Sibling taxa | ||
Synonyms | D. aureola var. paniculata | Alyssum dentatum, D. dentata, D. ramosissima var. glabrifolia |
Name authority | S. Watson: in W. H. Brewer et al., Bot. California 2: 430. (1880) | Desvaux: J. Bot. Agric. 3: 186. (1815) |
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