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

66. Draba murrayi G. A. Mulligan, Canad. J. Bot. 57: 1874. 1979.

Perennials; (cespitose); caudex often branched (covered with persistent leaves or leaf remains, branches sometimes terminating in sterile rosettes); not scapose. Stems unbranched, (0.4-)0.9-2.7(-3.5) dm, pubescent proxi-mally, glabrous distally, trichomes simple, 0.2-1 mm, and often smaller, fewer short-stalked, 2-4-rayed ones. Basal leaves rosulate; petiolate; petiole (0-0.7 cm), margin ciliate; blade oblanceolate to obovate, (0.3-)0.6-2.1(-2.8) cm × (1.5-)2.5-5(-9) mm, margins entire or sparsely denticulate, (ciliate, trichomes simple, 0.2-1.1 mm), surfaces pubescent with stalked, cruciform, and 2- or 3-rayed trichomes, (rays sometimes spurred), 0.1-0.6 mm, sometimes mostly simple trichomes adaxially. Cauline leaves 1-6; sessile; blade ovate or oblong to lanceolate, margins usually entire, rarely sparsely denticulate, surfaces pubescent as basal. Racemes 7-25- flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels divaricate-ascending, usually straight, rarely curved, (4-)7-18 mm, glabrous. Flowers: sepals ovate, 1.5-2.2 mm, pubescent, (trichomes simple and short-stalked, 2-rayed); petals white, obovate, 4-6 × 1.5-2.5 mm; anthers ovate, 0.4-0.5 mm. Fruits linear-lanceolate to narrowly elliptic, plane, flattened, 5-13 × 1.5-2 mm; valves glabrous; ovules 20-30 per ovary; style 0.6-1.5 mm. Seeds oblong, 0.9-1.2 × ca. 0.5 mm. 2n = 48.

Flowering Jun-Jul. Rock outcrops and talus, open forests, dry slopes, alluvial gravels; of conservation concern; 150-900 m; Yukon; Alaska.


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