Biennials or perennials; short-lived; apomictic or sexual; caudex present or absent. Stems usually 1 per caudex branch, arising from center of rosette near ground surface, 2-6.7 dm, densely pubescent proximally, trichomes short-stalked, 4-8-rayed, 0.1-0.3 mm, glabrous or sparsely pubescent distally. Basal leaves: blade oblanceolate, 2-5 mm wide, margins entire, sometimes ciliate near petiole base, trichomes (usually simple), to 0.7 mm, surfaces sparsely to moderately pubescent, trichomes short-stalked, 4-8-rayed, 0.1-0.3 mm. Cauline leaves: 7-40, often concealing stem proximally; blade auricles 1-4 mm, surfaces of distalmost leaves glabrous or sparsely pubescent. Racemes 10-60-flowered, usually unbranched. Fruiting pedicels descending to reflexed, most abruptly recurved near base, 5-10 mm, glabrous or sparsely pubescent, trichomes appressed, branched. Flowers divaricate to pendent at anthesis; sepals pubescent; petals white, 4-8 × 1-2 mm, glabrous; pollen ellipsoid or spheroid. Fruits descending to reflexed, not appressed to rachis, strongly secund, often curved, edges parallel, 0.35-0.65 cm × (2-)2.2-2.5 mm; valves glabrous; ovules 80-102 per ovary. Seeds uniseriate to sub-biseriate, 1.4-1.7 × 1-1.2 mm; wing continuous, to 0.2 mm wide. 2n = 14, 21.
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