Herbs perennial, (0.5-)1.5-14(-20) cm tall, cespitose, scapose. Caudex simple to many branched, ultimate branches terminated in rosettes and covered with petiolar remains of previous years. Stems erect, simple, often densely pubescent with a mixture of simple and subsessile forked trichomes, sometimes subhirsute with almost exclusively simple trichomes, rarely glabrous. Basal leaves rosulate, persistent; petiole absent or short, rarely to 2 cm, persistent, often ciliate with simple and/or long-stalked forked trichomes; leaf blade suborbicular, obovate, spatulate, oblanceolate, or lanceolate, (0.3-)0.5-2(-3) cm × (1-)2-6(-8) mm, sparsely or densely pubescent with simple trichomes, these often mixed abaxially with stalked forked and subsessile, 3-or 4-rayed stellate ones with unbranched rays, adaxially with predominantly simple trichomes, rarely glabrous except for margins, base cuneate to attenuate, margin entire or rarely 1-or 2-toothed on each side, apex obtuse to acute. Cauline leaves absent, sometimes 1, very rarely 2, sessile, similar to basal. Racemes (2-)4-15(-25)-flowered, ebracteate, subumbellate and not elongated or rarely subracemose and slightly elongated in fruit. Fruiting pedicels 1-7(-10) mm, divaricate or divaricate-ascending, straight or rarely slightly curved, tomentose or pilose abaxially, glabrous adaxially or rarely throughout. Sepals oblong or ovate, 1.5-2.5(-3) × 0.8-1.5(-1.8) mm, erect, caducous or rarely persistent, abaxially sparsely pilose or glabrous, base of lateral pair not saccate, margin narrowly membranous. Petals yellow, obovate to narrowly spatulate, 2.5-5(-6) × (0.9-)1.5-2.5(-3) mm, apex emarginate or rounded; claw absent, rarely 1(-2) mm. Filaments 1.5-2.5(-3) mm; anthers ovate, 0.2-0.4(-0.6) mm. Ovules (4-)6-12 per ovary. Fruit ovate to suborbicular, rarely ovate-lanceolate, (3-)4-9(-12) × 1.5-4.5(-6) mm, latiseptate and basally inflated, not twisted; valves glabrous or rarely puberulent with simple or forked trichomes, not veined, base obtuse, apex acute to subacuminate; style (0.1-)0.3-0.8(-1) mm. Seeds black to dark brown, ovate, (0.7-)1-1.5 × 0.5-0.9(-1) mm. Fl. and fr. Jun-Aug. 2n = 40*.
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