Perennials; (loosely cespitose); caudex branched (somewhat surculose, with persistent leaf bases, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3-1.1 dm, glabrous throughout or sparsely pubescent proximally, trichomes (2-)4-rayed, 0.1-0.3 mm. Basal leaves rosulate; petiolate; petiole obsolete, margin rarely ciliate proximally; blade (somewhat fleshy), broadly obovate to suborbicular or spatulate, 0.4-1.4(-1.7) cm × (2-)3-6(-7) mm, margins entire, surfaces pubescent, trichomes stalked, cruciform, and 2-, 3-, or 5-rayed, 0.2-0.6 mm. Cauline leaves 0 (or 1, as a bract). Racemes (5-)8-20(-27)-flowered, usually ebracteate, rarely proximalmost flowers bracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels horizontal to divaricate-ascending, straight or curved upward, 3-9 mm, glabrous. Flowers: sepals oblong, 3-4 mm, glabrous or sparsely pubescent, (trichomes subapical, short-stalked, 2-4-rayed); petals bright yellow, oblanceolate, 5-7 × 1.5-2.5 mm; anthers ovate, 0.5-0.6 mm. Fruits lanceolate-ovate to broadly ovate or oblong, slightly twisted or plane, strongly flattened, 5-11(-14) × (3.5-)4-6 mm; valves glabrous or, rarely, puberulent, trichomes simple and short-stalked, 2-or 3-rayed, 0.05-0.3 mm; ovules 12-18 per ovary; style 0.2-1.6(-2) mm. Seeds (winged), ovate, 1.8-2.8 × 1.2-2 mm; (wing 0.5-1 mm wide). 2n = 40.
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