Perennials; long-lived; (ces-pitose); sexual or apomictic; caudex woody. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 0.3–1.5(–2) dm, glabrous throughout. Basal leaves: blade linear-oblanceolate, 1–5(–8) mm wide, margins entire, usually ciliate at least proximally, trichomes (simple and/or short-stalked, 2- or 3-rayed), 0.1–0.3 mm, surfaces (sometimes the entire leaf) usually glabrous or (rarely, the youngest leaves of sterile shoots) pubescent, trichomes 4–6-rayed, 0.05–0.1 mm. Cauline leaves: 1–5, usually not concealing stem; blade auricles 0.5–1.5 mm or, rarely, absent, surfaces glabrous. Racemes 2–10(–15)-flowered, unbranched. Fruiting pedicels erect, straight, 3–8(–15) mm, glabrous. Flowers erect at anthesis; sepals glabrous; petals lavender to purplish, 6–8.5 × 1.5–3 mm, glabrous; pollen ellipsoid or spheroid. Fruits erect, appressed to rachis, not secund, straight, edges parallel, 3–5.6 cm × 1.5–2.5 mm; valves glabrous; ovules 34–64 per ovary; style 0.1–0.7 mm. Seeds biseriate or sub-biseriate, 1.5–2 × 1–1.5 mm; wing continuous, 0.3–0.5 mm wide.