Annuals or perennials; (short-lived); caudex simple or branched; not scapose. Stems branched or unbranched, (0.5-)0.8-3.2(-3.8) dm, pubescent throughout, trichomes 3-5-rayed, 0.1-0.4 mm, with simple and 2-rayed ones, 0.4-1 mm. Basal leaves rosulate; subsessile; petiole base ciliate, (trichomes simple and 2-rayed, 0.2-0.8 mm); blade oblanceolate, (0.7-)1-3.5 (-4.5) cm × 1.5-7(-9) mm, margins usually dentate, rarely entire, surfaces pubescent, abaxially with stalked, 3-6-rayed trichomes, 0.1-0.5 mm, adaxially with stalked, 3-5-rayed, 0.1-0.6 mm, and simple ones, to 0.8 mm. Cauline leaves (1 or) 2-5(-9); sessile; blade ovate to lanceolate, margins dentate or entire, surfaces pubescent as basal. Racemes (5-)8-30(-37)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem. Fruiting pedicels divaricate-ascending to ascending or suberect (not appressed to rachis), straight, (3-)4-10(-12) mm, pubescent, trichomes 3-5-rayed (0.1-0.4 mm), and sometimes simple. Flowers: (late-season ones petaliferous); sepals ovate, 1.7-2.5 mm, pubescent, (trichomes simple and stalked, 2-rayed); petals white, oblanceolate to spatulate, 2.8-3.5(-4) × 0.8-1.2 mm; anthers ovate, 0.2-0.3 mm. Fruits (erect, not appressed to rachis) lanceolate to linear-lanceolate, plane, flattened, (5-)7-12(-15) × 1.5-2.5(-3) mm; valves puberulent, trichomes simple and short-stalked, 2-4-rayed, 0.05-0.25 mm; ovules (24-)30-52 per ovary; style 0.03-0.1(0.15) mm. Seeds oblong, 0.8-1.1 × 0.5-0.6 mm, (often apiculate). 2n = 56.
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