Perennials; (cespitose, densely pulvinate); caudex branched (with persistent leaf bases, branches congested or somewhat creeping, sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.1-)0.2-0.6 (-1) dm, glabrous throughout or pubescent, trichomes sessile, pectinate, 0.1-0.3 mm, (their length parallel to long axis of stem). Basal leaves rosulate; sessile; blade linear to linear-oblanceolate, (0.2-)0.4-1.1(-1.5) cm × 0.4-1.5(-1.8) mm, margins entire, (not or, rarely, ciliate, trichomes simple, 0.2-0.4 mm), surfaces pubescent with sessile, pectinate trichomes, 0.1-0.4 mm, (their long axis parallel to prominent abaxial midvein), sometimes glabrous adaxially. Cauline leaves 0. Racemes 4-12 (-17)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous or pubescent as stem. Fruiting pedicels divaricate-ascending, straight, (2-)3-10 (-13) mm, glabrous or sparsely pubescent, trichomes pectinate. Flowers: sepals ovate, 1.5-3 mm, glabrous or sparsely pubescent, (trichomes pectinate, 2-rayed, or simple); petals usually yellow, rarely creamy white, obovate, 2.5-4 × 1.5-3 mm; anthers ovate, 0.4-0.5 mm, (not producing pollen). Fruits ovoid to lanceolate, plane, inflated at least basally, sometimes slightly flattened distally, 3-6(-7) × 2-3.5(-4) mm; valves usually puberulent, rarely glabrous, trichomes simple and sessile, often unequally 2-rayed, 0.07-0.35 mm; ovules 6-12 per ovary; style 0.1-0.8(-1.1) mm. Seeds ovoid, 1.1-1.5 × 0.7-1 mm. 2n = 32, 64.