Draba globosa |
Draba sierrae |
|
---|---|---|
beavertip Draba, rockcress Draba, round-fruit Draba |
Sierra Draba |
|
Habit | Perennials; (cespitose, pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. | Perennials; (cespitose, pulvinate, canescent); caudex branched (covered with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. |
Stems | unbranched, 0.1–0.5 dm, glabrous. |
unbranched, (0.05–)0.1–0.4 dm, pubescent throughout, trichomes pectinate or 2–4-rayed, 0.1–0.4 mm, and sometimes simple. |
Basal leaves | rosulate; sessile; blade (not fleshy), narrowly oblanceolate or lanceolate to linear, (0.2–)0.3–0.8 cm × 0.5–1.6(–2) mm, margins entire (ciliate, trichomes simple, 0.1–0.8 mm, apex acute, trichomes usually longer), surfaces glabrous, (midvein obscure abaxially). |
(densely imbricate); rosulate; sessile; blade oblong, 0.2–0.6(–0.8) cm × 0.7–1.5(–2) mm, margins entire, (sometimes ciliate, trichomes simple, 0.5–1 mm), surfaces densely pubescent with stalked, subdendritic, 7–12-rayed trichomes, 0.2–0.5 mm. |
Cauline leaves | 0. |
0. |
Racemes | 2–5(–7)-flowered, ebracteate, slightly elongated in fruit; rachis not flexuous, glabrous. |
2–6(–9)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. |
Flowers | sepals (persistent to near fruit maturity), ovate to broadly oblong, 2–3 mm, glabrous; petals white to pale yellow, obovate, 2.5–4 × 1.2–2 mm; anthers oblong, 0.4–0.6 mm. |
sepals oblong, 2.5–3.5 mm, pubescent, (trichomes short-stalked, branched); petals yellow, spatulate, 4–5 × 1.2–1.8 mm; anthers oblong, 0.5–0.7 mm. |
Fruiting pedicels | divaricate-ascending, straight or slightly curved, 2–6 mm, glabrous. |
divaricate to ascending, straight, 2–5(–7) mm, pubescent as stem. |
Fruits | ovate, plane, flattened, 4.5–8 × 2.5–4 mm; valves (distinctly veined), glabrous; ovules 8–16 per ovary; style (0.1–)0.2–0.6 mm. |
lanceolate to elliptic or broadly oblong to ovate-orbicular, often twisted, occasionally plane, flattened, 4–8(–10) × (2–)3–4.5 mm (asymmetric); valves pubescent, trichomes short-stalked, subpectinate, or 2–4-rayed, 0.05–0.3 mm, sometimes with simple ones; ovules 8–14(–16) per ovary; style (0.1–)0.3–0.7(–1) mm. |
Seeds | oblong, 1.1–1.4 × 0.8–1 mm. |
ovoid, 1.2–1.5 × 0.7–1 mm. |
Draba globosa |
Draba sierrae |
|
Phenology | Flowering Jun–Aug. | Flowering Jun–Aug. |
Habitat | Ridges, talus, alpine tundra and meadows | Granite outcrops, rocky slopes |
Elevation | 2700-3900 m (8900-12800 ft) | 3500-3900 m (11500-12800 ft) |
Distribution |
ID; MT; UT; WY
|
CA |
Discussion | Draba globosa is an apomictic species closely related to D. burkei (M. D. Windham, unpubl.). Though often treated as a variety of D. densifolia, it is morphologically and phyletically distinct from that species. Both R. C. Rollins (1993) and N. H. Holmgren (2005b) indicated that the species occurs in Colorado, but we have not seen material for that state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Of conservation concern. Draba sierrae is known only from the southern Sierra Nevada in east-central California (Inyo and Fresno counties). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 7, p. 308. | FNA vol. 7, p. 337. |
Parent taxa | Brassicaceae > tribe Arabideae > Draba | Brassicaceae > tribe Arabideae > Draba |
Sibling taxa | ||
Synonyms | D. apiculata, D. densifolia var. apiculata, D. densifolia var. decipiens, D. densifolia var. globosa | |
Name authority | Payson: Amer. J. Bot. 4: 257. (1917) | Sharsmith: Madroño 5: 149. (1940) |
Web links |