Perennials; caudex simple or branched (branches short); not scapose. Stems unbranched or branched distally, (0.6-)1-3 (-3.8) dm, pubescent through-out, trichomes simple, 0.5-1 mm, with 4-10-rayed ones, 0.05-0.2 mm (mostly branched on basal parts). Basal leaves rosulate; petiolate; petiole ciliate throughout; blade linear to oblanceolate or oblong, (0.5-)0.8-2(-3.5) cm × 1.5-4(-11) mm, margins entire or dentate, (base and apex ciliate, trichomes simple, 0.3-0.8 mm), surfaces pubescent with short-stalked, 4-12-rayed trichomes, 0.1-0.3 mm. Cauline leaves 3-10(-17), (not overlapping); sessile; blade lanceolate to ovate or oblong, margins entire or dentate, surfaces pubescent as basal (adaxially with simple and forked trichomes near blade base). Racemes (10-)15-47 (-63)-flowered, basally bracteate, often considerably elongated in fruit; rachis not flexuous, densely pubescent, trichomes 4-10-rayed (0.05-0.2 mm), and fewer simple ones. Fruiting pedicels suberect or ascending, straight, 2-5(-10) mm, pubescent as rachis. Flowers: sepals (green or lavender), oblong to ovate, 1.5-2 mm, pubescent, (trichomes simple and few-rayed); petals white, oblanceolate to spatulate, 2.3-3.7(-4.5) × 0.7-1.7 mm; anthers ovate, 0.1-0.2 mm. Fruits (subappressed to rachis), linear-lanceolate to linear or, rarely, ovate-oblong, slightly twisted or plane, flattened, (5-) 6-11 × 1.5-2(-2.5) mm; valves pubescent, trichomes short-stalked, 3-7-rayed, 0.05-0.3 mm; ovules 28-48 per ovary; style 0.1-0.6 mm. Seeds ovoid, 0.5-0.7(-0.9) × 0.3-0.5 mm. 2n = 32.
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Perennial with dense basal rosettes, the numerous lvs oblanceolate or spatulate, densely stellate-hairy, commonly less than 3 cm; cauline lvs (3–)5–8(–12), lanceolate to ovate, 5–20 mm; stems 1–3 dm; raceme elongating, the lower fls remote, axillary, only the upper crowded; pet white, 4 mm; frs closely ascending on short pedicels, oblong to lance-oblong, broader at the base than at the tip, often twisted, 5–12 × 1.5–2 mm, stellate-hairy; persistent style 0.2–0.5 mm; 2n=32. Rocky ledges and gravelly or rocky soil; Siberia and boreal Amer., s. in our range to N.B., the mts. of n. N. Engl., n. Mich., and e. Wis. May–July. (D. lanceolata and D. stylaris, both misapplied)
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