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

40. Draba graminea Greene, Pl. Baker. 3: 5. 1901.

Braya graminea (Greene) M. E. Jones; Draba chrysantha S. Watson var. graminea (Greene) O. E. Schulz; D. chrysantha var. hirticaulis O. E. Schulz

Perennials; (cespitose); caudex simple or branched (with persistent leaf bases); not scapose. Stems unbranched, 0.1-0.5(-0.8) dm, usually pubescent throughout, rarely glabrous, trichomes simple or subsessile, 2-rayed or spurred, (crisped), 0.1-0.5 mm. Basal leaves rosulate; petiolate; petiole ciliate, (trichomes usually straight and simple, rarely also 2-rayed, 0.2-0.6(-0.8) mm); blade linear to linear-oblanceolate, (0.5-)1-4 cm × 0.3-2(-3) mm, margins entire (pubescent as petiole), surfaces glabrous. Cauline leaves (1-)3-9(-12) (as bracts); sessile; blade linear to oblanceolate or lanceolate, margins entire, (ciliate proximally, similar to basal). Racemes 3-15-flowered, bracteate, elongated in fruit; rachis not flexuous, usually pubescent as stem, rarely glabrous. Fruiting pedicels divaricate-ascending, usually straight, rarely curved upward, 3-10(-15) mm, usually pubescent as stem, rarely glabrous. Flowers: sepals ovate, 1.5-2.5 mm, glabrous or pubescent, (trichomes simple and short-stalked, 2-rayed); petals yellow, spatulate to obovate, 3-5 × 1.5-3 mm; anthers ovate, 0.3-0.5 mm. Fruits ovate-elliptic to lanceolate, slightly twisted or plane, flattened, 5-11 × 2.5-5 mm; valves glabrous; ovules 8-16 per ovary; style 0.2-0.7 mm. Seeds ovoid, 1.2-1.5 × 0.7-1 mm. 2n = 18.

Flowering Jul-Sep. Rocky areas and ridges, alpine tundra, gravel bars in streams; of conservation concern; 3000-4100 m; Colo.

Draba graminea is occasionally confused with D. crassa, which occupies similar habitats and elevations. It is easily distinguished from the latter by having narrower [0.3-2(-3) versus 2.5-8(-10) mm wide] basal leaves and bracteate (versus ebracteate) racemes. It is known to us only from Hinsdale, La Plata, Ouray, San Juan, and San Miguel counties.


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