Biennials or perennials; usually short-lived; sexual; caudex usually not woody. Stems usually 1-4 per caudex branch, usually arising from center of rosette near ground surface, rarely arising laterally proximal to sterile shoots, 1.5-8(-10.2) dm, glabrous or sparsely pubescent proximally, trichomes sessile, usually 2-rayed, rarely simple, 0.3-0.7 mm, glabrous distally. Basal leaves: blade oblanceolate, 1.5-8(-14) mm wide, margins usually entire, rarely dentate, ciliate, trichomes (sessile, usually 2-rayed, rarely simple ones at petiole base), surfaces usually pubescent, sometimes glabrous, trichomes sessile, 2-rayed (malpighiaceous), 0.3-0.7 mm. Cauline leaves: 6-52, concealing stem proximally; blade auricles 0.5-3 mm, surfaces of distalmost leaves glabrous. Racemes 8-35(-80)-flowered, usually unbranched. Fruiting pedicels erect, straight, 5-18 (-25) mm, glabrous. Flowers erect at anthesis; sepals glabrous; petals white (usually aging pale lavender), (5-)7-11 × 1.5-2.7 mm, glabrous; pollen ellipsoid. Fruits erect, appressed to rachis, not secund, straight, edges parallel, 4-9(-10.2) cm × 1.5-3.5 mm; valves glabrous; ovules 110-216 per ovary; style 0.05-0.3 mm. Seeds biseriate, 1.3-2.2 × 1-1.6 mm; wing lateral and distal, 0.3-0.8 mm wide. 2n = 14.
Home