Difference between revisions of "Draba sharsmithii"

Rollins & R. A. Price

Harvard Pap. Bot. 1(3): 71. 1991.

Basionym: Draba cruciata var. integrifolia C. L. Hitchcock & Sharsmith Madroño 5: 151. 1940,
Treatment appears in FNA Volume 7. Treatment on page 336. Mentioned on page 282, 337.
FNA>Volume Importer
FNA>Volume Importer
(No difference)

Revision as of 22:54, 16 December 2019

Perennials; (densely cespitose); caudex branched (covered with persistent leaves or leaf remains, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.15–)0.3–0.7(–1) dm, glabrous throughout or pubescent proximally, trichomes simple and 2-rayed, 0.1–0.4 mm. Basal leaves rosulate; petiolate; petiole base and margin ciliate, (trichomes simple and 2-rayed, 0.3–1 mm); blade oblanceolate to oblong-obovate or oblong, 0.4–0.7(–1) cm × 1–3(–5) mm, margins entire, surfaces pubescent abaxially with short-stalked, 2–5-rayed trichomes, 0.1–0.4 mm, adaxially glabrous or sparsely pubescent, with simple and short-stalked, 2-rayed trichomes. Cauline leaves 0. Racemes 2–10(–16)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels ascending, straight, (3–)5–12(–16) mm, glabrous. Flowers: sepals ovate, 2.8–3.5 mm, sparsely pubescent, (trichomes simple and short-stalked, 2–4-rayed); petals yellow, spatulate to oblanceolate, 4–6 × 2–3 mm; anthers oblong, 0.6–0.7 mm. Fruits oblong to lanceolate or narrowly ovate, twisted (curved), flattened, (5–)8–15(–20) × 2–4(–5) mm; valves usually glabrous, rarely pubescent, trichomes simple and short-stalked, 2-rayed, (marginal), 0.5–0.15 mm; ovules 16–20 per ovary; style (0.5–)0.9–1.8(–2) mm. Seeds oblong, 1–1.6 × 0.6–0.7 mm. 2n = 36.


Phenology: Flowering Jul–Aug.
Habitat: Granitic outcrops and rocky slopes in open subalpine conifer communities
Elevation: 3300-3800 m

Discussion

Of conservation concern.

Draba sharsmithii is clearly related to D. cruciata; there is some evidence that it may be an allopolyploid incorporating a genome from that species. It is known only from the vicinity of Mount Whitney in the southern Sierra Nevada (Inyo County).

Selected References

None.

Lower Taxa

None.
... more about "Draba sharsmithii"
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Rollins & R. A. Price +
Draba cruciata var. integrifolia +
3300-3800 m +
Granitic outcrops and rocky slopes in open subalpine conifer communities +
Flowering Jul–Aug. +
Harvard Pap. Bot. +
Abdra +, Erophila +, Nesodraba +  and Tomostima +
Draba sharsmithii +
species +