Annuals, biennials, or, rarely, perennials; (short-lived); not scapose. Stems usually branched, (0.6-)1.2-2.8(-3.6) dm, pubes-cent proximally, glabrous distally, trichomes simple, 0.3-1.3 mm, and 2-4-rayed, 0.1-0.6 mm. Basal leaves rosulate; petiole (0-2 cm), densely pubescent, (trichomes simple and 2-4-rayed, not ciliate); blade spatulate to obovate or oblanceolate, (1.5-)3-8 (-10) cm × 7-25(-33) mm, margins dentate to denticulate, surfaces pubescent with long-stalked, cruciform, and fewer 2-or 3-rayed trichomes, 0.1-0.6 mm. Cauline leaves 1-3; sessile; blade oblong to ovate, margins entire, surfaces pubescent as basal. Racemes 12-40(-51)-flowered, ebracteate, elongated in fruit; rachis not flexuous, usually glabrous, rarely proximally with relatively few trichomes. Fruiting pedicels horizontal to divaricate, straight, (6-)9-18(-22) mm, usually glabrous, rarely sparsely pubescent as stem proximally. Flowers: sepals oblong, 2.5-3.5 mm, sparsely pubescent, (trichomes simple and 2-4-rayed); petals yellow, spatulate, (5-)6-8.5 × 2.2-3.5 mm; anthers oblong, 0.7-0.9 mm. Fruits linear-elliptic to elliptic-lanceolate, slightly twisted, flattened, 6-19 × 2.5-3.5 mm; valves glabrous or pubescent, trichomes simple and short-stalked, 2(-4)-rayed, 0.07-0.3 mm; ovules 24-36 per ovary; style (0.8-)1-2.2 mm. Seeds oblong, 1-1.4 × 0.7-0.8 mm. 2n = 22.
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