Perennials; (sometimes cespi-tose); caudex simple or branched; not scapose. Stems branched or unbranched, (0.5-)0.7-3(-4.5) dm, pubescent proximally, glabrous or pubescent distally, trichomes sessile (non-crisped), 4-or 5-rayed, stellate, or subpectinate, 0.07-0.4 mm. Basal leaves rosulate; petiolate; petiole base and margin sparsely ciliate, (trichomes simple and 2-rayed, 0.2-0.8 mm); blade oblanceolate to spatulate or linear-oblanceolate, 1-3.8(-5) cm × 2-5(-8) mm, margins dentate or denticulate, surfaces pubescent with sessile, non-crisped, 4-or 5-rayed, stellate trichomes, 0.07-0.5 mm, (some rays branched, appearing 2-12-rayed, midvein obscure abaxially). Cauline leaves (2 or) 3-10 (-13); sessile; blade ovate to oblong, margins dentate to subentire, surfaces pubescent as basal. Racemes 5-18(-25)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous or pubescent as stem. Fruiting pedicels divaricate-ascending to suberect, straight or slightly curved, (3-)4-10(-13) mm, glabrous or pubescent as stem. Flowers: sepals oblong, 1.7-2.5 mm, pubescent, trichomes short-stalked, 3-or 4-rayed; petals white, broadly obovate, 3.5-5 × 1.5-2.5 mm; anthers ovate, 0.4-0.5 mm. Fruits ovate to lanceolate or linear-lanceolate, usually slightly twisted, rarely plane, flattened, 5-11(-14) × 2-3.5 mm; valves usually glabrous, rarely pubescent, trichomes 3-or 4-rayed, 0.07-0.2 mm; ovules 20-28(-32) per ovary; style (0.2-) 0.4-1 mm. Seeds oblong, 0.8-1.1 × 0.6-0.8 mm. 2n = 96.
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Perennial, 1–4 dm, simple to freely branched above; basal lvs narrowly oblanceolate to spatulate, to 6 cm, often sharply toothed, uniformly stellate-hairy; cauline lvs few to several, oblong to obovate, narrowed or acute at base, often dentate; mature racemes loose, to 10 cm, commonly glabrous or nearly so; pet yellow in bud, white at anthesis, 4–6 mm; frs glabrous, lanceolate to narrowly oblong, 7–12 mm long, a fourth or a fifth as wide, usually soon twisted, or in depauperate specimens shorter, ovate, and straight; persistent style 0.3–0.8 mm; 2n=96. Rocks and cliffs; Nf. to w. Ont., s. to n. N. Engl., N.Y., and n. Mich. May, June.
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