Perennials; short-to long-lived; (cespitose); sexual; caudex usually not woody. Stems usually 3-7 per caudex branch, arising from margin of rosette near ground surface, or arising laterally proximal to sterile shoots, 0.4-2.5 dm, glabrous or pubescent proximally, trichomes simple and short-stalked, 2-rayed, 0.1-0.4 mm, glabrous distally. Basal leaves: blade linear to linear-oblanceolate, 1-2.5 mm wide, margins usually entire, rarely denticulate, often ciliate, trichomes (simple), 0.3-0.7 mm, surfaces glabrous or sparsely pubescent, trichomes short-stalked, 2-or 3-rayed, 0.1-0.4 mm. Cauline leaves: 3-12, not concealing stem; blade auricles absent, surfaces of distalmost leaves usually glabrous, rarely sparsely pubescent. Racemes 2-12-flowered, unbranched. Fruiting pedicels divaricate-ascending to horizontal, slightly to strongly recurved, 3-8 mm, glabrous or sparsely pubescent, trichomes (isolated), simple. Flowers ascending-divaricate at anthesis; sepals glabrous or pubescent; petals white to pale lavender, 4-5 × 1.5-2 mm, glabrous; pollen ellipsoid. Fruits pendent, not appressed to rachis, not or, rarely, weakly secund, straight, edges parallel, 1.5-3.5 cm × 1.2-2 mm; valves glabrous; ovules 28-44 per ovary; style 0.1-0.4 mm. Seeds uniseriate, 0.9-1.2 × 0.6-1 mm; wing often continuous, 0.07-0.1 mm wide.
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