Perennials; (cespitose, pulvinate); caudex branched (dense with persistent leaf remains, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.05-)0.2-1(-1.7) dm, usually glabrous, rarely pubescent, trichomes usually simple, 0.3-0.8 mm, and 2-4 (or 5)-rayed, 0.1-0.6 mm, (rarely predominantly simple ones). Basal leaves rosulate; sessile; blade linear to oblong or oblanceolate-linear, 0.3-0.9(-1.4) cm × 0.5-1.5(-2) mm, margins entire, (ciliate, trichomes simple, 0.3-1.2 mm), surfaces glabrous or sparsely pubescent, abaxially with short-stalked, 2-4-rayed trichomes, 0.1-0.3 mm (midvein prominent), adaxially rarely with subapical, simple trichomes. Cauline leaves 0. Racemes 2-10(-22)-flowered, ebracteate, not or slightly elongated in fruit; rachis not or slightly flexuous, glabrous or pubescent as stem. Fruiting pedicels divaricate-ascending to ascending (not decurrent basally), straight, (0.7-)1.5-10(-25) mm, usually glabrous, rarely sparsely pubescent, trichomes predominantly simple (0.2-0.7 mm), sometimes 2-4 (or 5)-rayed, (0.1-0.5 mm). Flowers: sepals ovate, 2-3 mm, usually sparsely pubescent, rarely glabrous, (trichomes simple and short-stalked, 2-4-rayed); petals pale yellow (sometimes fading white), oblanceolate to obovate, 2-5 × 1-1.7(-2) mm; anthers ovate or oblong, 0.4-0.6 mm. Fruits ovoid or ovate-lanceolate, plane (not curved), flattened, (2.5-)3-6(-8) × 2-3 mm; valves pubescent or puberulent, trichomes simple and short-stalked, 2-5-rayed, 0.1-0.4 mm; ovules 4-12 per ovary; style 0.3-0.6(-1) mm. Seeds oblong to ovoid, 1.2-2 (-2.6) × 0.9-1.2(-1.4) mm. 2n = 36.
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