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

47. Draba incana Linnaeus, Sp. Pl. 2: 643. 1753.

Draba confusa Ehrhart; D. contorta Ehrhart; D. incana subsp. confusa (Ehrhart) E. Ekman; D. incana var. confusa (Ehrhart) Liljeblad; D. incana var. contorta (Ehrhart) Liljeblad

Biennials; not scapose. Stems usually branched, rarely unbranched, (0.3-)0.6-3(-4) dm, densely pubescent proximally, trichomes simple, 0.4-1.3 mm, with fewer 2-4-rayed ones, to 0.3 mm, (distally with mostly branched trichomes, with fewer, simple ones). Basal leaves rosulate; petiolate; petiole base and margin ciliate, (trichomes simple, 0.2-0.7 mm); blade lanceolate or oblanceolate to spatulate, 0.5-2.9 cm × 1-5(-9) mm, margins dentate, surfaces pubescent, abaxially with stalked, cruciform, or 2- or 3-rayed trichomes, 0.1-0.4 mm, (rarely with a branched ray), adaxially with simple trichomes, 0.1-0.7 mm, and stalked, 2-4-rayed ones. Cauline leaves (15-)22-54 (-76), (densely imbricate at least basally); sessile; blade ovate to oblong or lanceolate (base often densely bearded abaxially, trichomes simple, to 1.3 mm), margins dentate, surfaces pubescent as basal. Racemes (11-)17-36(-48)- flowered, bracteate basally, elongated or not in fruit; rachis not flexuous, pubescent as stems distally. Fruiting pedicels erect to ascending, (subappressed to rachis), straight, (1.5-)2.5-6(-13) mm, pubescent, trichomes 2-4-rayed and simple. Flowers: sepals ovate, 2-2.5 mm, pubescent, (trichomes simple and short-stalked, 2-4-rayed); petals white, spatulate, 3.5-4.5 × 1-2 mm; anthers ovate, 0.3-0.4 mm. Fruits oblong to linear-lanceolate or elliptic, slightly twisted or plane, flattened, 5-10(-12) × 1.5-2.5(-3) mm; valves glabrous or pubescent, trichomes simple and short-stalked, 2-4-rayed, 0.05-0.3 mm; ovules (24-)30-40 per ovary; style 0.01-0.25 mm. Seeds oblong, 0.7-1.1 × 0.5-0.6 mm. 2n = 32.

Flowering Jul-Aug. Rock outcrops, talus, gravelly shores; 0-200 m; Greenland; Man., N.B., Nfld. and Labr., Ont., P.E.I., Que.; Mich., Minn.; n, c Europe (Russia).


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