Perennials; (cespitose, forming loose mats); caudex branched (with some persistent leaf bases, branches often creeping, sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.4-)0.7-1.7(-2.2) dm, usually glabrous, rarely proximalmost parts and sterile shoots pubescent, trichomes short-stalked, 2-4-rayed, 0.2-0.5 mm. Basal leaves rosulate; sessile; blade oblanceolate, (0.5-)0.7-1.4(-2) cm × 1.5-3.5(-5) mm, margins entire, surfaces pubescent with stalked, cruciform, and 2-or 3-rayed trichomes, 0.2-0.6 mm, (sometimes trichomes only on margins or apex, not ciliate, midvein obscure abaxially). Cauline leaves 0. Racemes 5-18(-23)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels divaricate-ascending to ascending (not expanded basally), straight, 5-13(-18) mm, glabrous. Flowers: sepals ovate, 2.5-4 mm, glabrous; petals yellow, oblanceolate, 5-7 × 2-3 mm; anthers ovate, 0.5-0.6 mm. Fruits broadly ovate to lanceolate, plane (not curved), flattened, (3-)4-6.5(-8) × 2-3 mm; valves glabrous or puberulent, trichomes simple, 0.05-0.2 mm; ovules 4-8 per ovary; style 0.6-1.7 mm. Seeds ovoid to oblong, 1.6-2 × 1-1.3 mm. 2n = 16, 32.
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