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FNA | Family List | FNA Vol. 7 | Brassicaceae | Draba

33. Draba cyclomorpha Payson, Amer. J. Bot. 4: 263. 1917.

Draba lemmonii S. Watson var. cyclomorpha (Payson) O. E. Schulz

Perennials; (cespitose, not pulvinate); caudex branched (with persistent petiole remains, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.1-0.6(-1) dm, (thinly) pilose throughout, trichomes simple and stalked, 2- (or 3-)rayed, (often crisped), 0.1-0.8 mm. Basal leaves rosulate; shortly petiolate; petiole base and margin ciliate, (trichomes simple, 0.2-1 mm); blade (somewhat fleshy), oblanceolate to obovate, 0.4-1 cm × 2-5 mm, margins entire, surfaces glabrous or hirsute, abaxially usually with stalked, 2-rayed trichomes, 0.1-0.6 mm, rarely with fewer, simple ones, (midvein obscure), adaxially with almost exclusively simple trichomes, to 0.6 mm. Cauline leaves 0. Racemes 5-14(-20)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels horizontal to divaricate-ascending, often curved upward or straight, 3-8(-10) mm, pilose as stem. Flowers: sepals ovate, 1.5-2.2 mm, pubescent, (trichomes simple and short-stalked, 2-rayed); petals yellow, spatulate, 4-5.5 × 1.5-2.5 mm; anthers oblong, 0.6-0.7 mm. Fruits oblong to oblong-ovate, plane, flattened, 3.5-9 × 2.5-4 mm; valves glabrous; ovules 8-12 per ovary; style 0.3-1 mm. Seeds ovoid, 1.4-1.9 × 1-1.2 mm.

Flowering Jul-Aug. Basaltic talus, stony ridges; 2500-3100 m; Oreg.

Draba cyclomorpha was treated by Schulz, C. L. Hitchcock (1941), and R. C. Rollins (1993) as a variety of D. lemmonii. The two taxa are quite distinct morphologically and separated by nearly 1600 kilometers, justifying their treatment as distinct species (I. A. Al-Shehbaz and M. D. Windham 2007). Draba cyclomorpha is known to us only from the Wallowa Mountains.


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