Biennials or perennials; short-lived; apomictic; caudex present or absent. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, (1.2-) 2-12 dm, glabrous or pubescent proximally, trichomes simple and sessile or subsessile, 2 or 3(-6)-rayed, to 1 mm, glabrous distally. Basal leaves: blade oblanceolate, 1.5-10(-20) mm wide, margins entire or dentate, ciliate proximally, trichomes (simple), to 1 mm, surfaces sparsely to densely pubescent, trichomes sessile or subsessile, 2-4(-7)-rayed, 0.2-0.6 mm. Cauline leaves: (10-)13-52, often concealing stem proximally; blade auricles 1-5 mm, surfaces of distalmost leaves glabrous. Racemes 16-88-flowered, usually unbranched. Fruiting pedicels divaricate-ascending to descending, usually gently curved downward, rarely straight, 5-22(-30) mm, glabrous. Flowers divaricate at anthesis; sepals glabrous or pubescent; petals usually white, rarely lavender, 5.5-8 × 1-2 mm, glabrous; pollen spheroid. Fruits divaricate-ascending to pendent, not appressed to rachis, not secund, straight or slightly curved, edges parallel, 3.5-9 cm × 1-1.8 mm; valves glabrous; ovules 84-146 per ovary; style 0.05-0.5 mm. Seeds uniseriate to sub-biseriate, 1-1.8 × 0.8-1.2 mm; wing continuous, 0.1-0.25 mm wide. 2n = 21.
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