Perennials; (cespitose, usually forming mats); caudex branched (covered with persistent leaf bases); usually scapose. Stems unbranched, 0.2-0.8(-1.2) dm, pubescent throughout, trichomes minutely stalked, 8-15-rayed, stellate, (non-crisped), 0.03-0.15 mm. Basal leaves rosulate; petiole (obsolete), ciliate throughout; blade oblanceolate to obovate, 0.2-0.9(-1.5) cm × 1-3(-5) mm, margins entire, (not ciliate), surfaces usually pubescent, rarely glabrescent, with short-stalked, 8-15-rayed, stellate, (non-crisped) trichomes, 0.05-0.15 mm. Cauline leaves 0 or 1; sessile; blade ovate or oblong, margins entire, surfaces pubescent as basal. Racemes 3-9(-11)-flowered, ebracteate, elongated in fruit; rachis often slightly flexuous, pubescent as stem. Fruiting pedicels usually ascending, rarely divaricate, straight, 1-4.5(-8) mm, pubescent as stem. Flowers: sepals ovate, 1.5-2 mm, pubescent, (trichomes simple and short-stalked, 2-5-rayed); petals white, spatulate to oblanceolate, 2-3.5 × 0.8-1.4 mm; anthers ovate, 0.2-0.3 mm. Fruits elliptic to narrowly oblong-elliptic, twisted or not, flattened, 3.5-9 × 1.5-2.2 mm; valves usually glabrous, rarely with 3-6-rayed trichomes on replum; ovules 12-24(-28) per ovary; style 0.1-0.4 mm. Seeds ovoid, 0.6-1 × 0.5-0.6 mm. 2n = 16.
Home