Annuals; scapose. Stems (few to many from base), unbranched, (0.2-)0.5-2(-3) dm, pubescent proximally, glabrous distally, trichomes simple and 2(-4)-rayed, 0.1-0.4 mm. Basal leaves rosulate; petiolate; blade obovate, spatulate, oblanceolate, lanceolate, oblong, or, rarely, linear, 0.2-1.8(-3) cm × (0.5-)1-5(-10) mm, margins entire or 1-5-toothed on each side, surfaces pubescent with simple or stalked, 2-4-rayed trichomes, 0.1-0.5 mm. Cauline leaves 0. Racemes 4-20(-30)-flowered, ebracteate, usually considerably elongated in fruit; rachis usually flexuous, glabrous. Fruiting pedicels divaricate to ascending, straight or slightly curved upward, (2-) 5-20(-35) mm, glabrous. Flowers: sepals (green or purplish), oblong, 1-2.5 mm, glabrescent or pubescent, (trichomes simple or 2-rayed); petals white, deeply 2-fid, (1.5-)2-4.5(-6) × 1-2 mm; anthers ovate, 0.2-0.4 mm. Fruits obovate, oblanceolate, lanceolate, elliptic, oblong, or linear, plane, flattened, (2.5-)4-9(-12) × 1.5-2.5(-3.5) mm; valves glabrous; ovules (20-)32-70(-84) per ovary; style 0.02-0.2 mm. Seeds ovoid (slightly flattened), 0.3-0.6(-0.8) × 0.2-0.4 mm. 2n = 14, 16, 20, 24, 28, 30, 32, 34, 36, 38, 40, 52, 54, 58, 60, 64.
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Annual or winter-annual with very slender scapes 5–20 cm; lvs crowded in a basal rosette, oblanceolate to spatulate or obovate-oblong, 1–2 cm, with simple and branched hairs; pedicels ascending, the lowest to 3 cm in fr; fls white, 2–3 mm wide; pet bifid nearly to the middle; fr 4–10 mm, glabrous; 2n=14–64. Native of Eurasia, naturalized throughout much of N. Amer. Apr., May. (Erophila v.) Complex sp., often divided into several intraspecific taxa of doubtful significance.
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