Perennials; (cespitose, forming loose mats); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, 0.3-0.6(-0.9) dm, glabrous. Basal leaves subrosulate; subsessile; blade oblanceolate to obovate, 0.3-0.8(-1.3) cm × 1-2.5 mm, margins entire, (ciliate, trichomes simple, subsetiform, 0.25-0.8 mm), surfaces glabrous. Cauline leaves 0. Racemes 4-10-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous. Fruiting pedicels divaricate-ascending to ascending, straight, 4-9(-15) mm, glabrous. Flowers: sepals broadly ovate, 2-3.5 mm, glabrous or sparsely pubescent, (trichomes simple, 0.07-0.35 mm); petals yellow, oblanceolate, 4-6 × 1.5-2 mm; anthers ovate, 0.4-0.5 mm. Fruits ovate, plane, flattened, 3-5.5 × 2-3.2 mm; valves glabrous or puberulent, trichomes simple, 0.02-0.08 mm; ovules 4-10 per ovary; style 0.5-1.7 mm. Seeds ovoid, 1-1.4 × 0.7-1 mm. 2n = 20.
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