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.
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