Perennials; usually short-lived; sexual; caudex not woody. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, (1.5-)2.5-8 dm, densely pubescent proximally, trichomes simple and short-stalked, 2-rayed, to 1 mm, sparsely pubescent or glabrous distally. Basal leaves: blade oblanceolate, 1-7 mm wide, margins entire or dentate, ciliate along petiole, trichomes (simple), to 0.7 mm, surfaces moderately to densely pubescent, trichomes short-stalked, 5-8-rayed, 0.15-0.4 mm. Cauline leaves: (8-)15-40, concealing stem proximally; blade auricles 1-3 mm, surfaces of distalmost leaves usually sparsely pubescent. Racemes (15-)30-90-flowered, usually unbranched. Fruiting pedicels reflexed, abruptly recurved at base, otherwise straight, 4-13 mm, glabrous or sparsely pubescent, trichomes usually simple. Flowers descending to pendent at anthesis; sepals pubescent; petals usually white, rarely lavender, 4-6 × 0.8-1.5 mm, glabrous; pollen ellipsoid. Fruits strongly reflexed, usually appressed to rachis, rarely somewhat secund, straight, edges parallel, 3.5-6 cm × 0.9-1.5 mm; valves glabrous; ovules 70-126 per ovary; style 0.2-0.5 mm. Seeds uniseriate, 1-1.4 × 0.8-1 mm; wing continuous (rarely absent), to 0.1 mm wide. 2n = 14.
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