Biennials or perennials; (short-lived, not cespitose); caudex simple (not fleshy); scapose. Stems often unbranched, (0.2-)0.4-3(-3.4) dm, pubescent proximally, usually glabrous distally, rarely sparsely pubescent, trichomes short-stalked, 2-4-rayed, 0.1-0.4(-0.5) mm. Basal leaves rosulate; petiole (obscure), margin ciliate, (trichomes simple, 0.2-0.4 mm); blade oblanceolate to obovate, 0.4-2.6(-3.1) cm × 1.5-7(-10) mm, margins entire or denticulate, (ciliate as petiole), surfaces pubescent, abaxially with short-stalked, 3-or 4-rayed trichomes, 0.1-0.5 mm, adaxially with simple and stalked, 2-4-rayed trichomes, 0.1-0.5 mm. Cauline leaves (0 or) 1 or 2 (3 or 4); sessile; blade elliptic to lanceolate or ovate, margins toothed, surfaces pubescent, abaxially with short-stalked 3-or 4-rayed trichomes, adaxially with simple and short-stalked, 2-4-rayed trichomes. Racemes (2-)4-10(-15)-flowered, ebracteate, elongated in fruit; rachis not flexuous, usually glabrous, rarely sparsely pubescent. Fruiting pedicels horizontal to divaricate-ascending, straight, 3-14(-19) mm (subequaling or shorter than fruit), usually glabrous, rarely pubescent, trichomes 2-4-rayed. Flowers (chasmogamous, petaliferous); sepals (green or purplish), oblong, 1.5-2.5 mm, glabrous or pubescent, (trichomes simple); petals yellow, oblanceolate, 2.5-3.5 × 0.6-1 mm; anthers ovate, 0.25-0.4 mm. Fruits linear or, rarely, linear-elliptic, plane, flattened, (8-)10-17 (-20) × 1.5-2 mm; valves usually glabrous, rarely sparsely puberulent, trichomes simple; ovules 24-36 per ovary; style 0.01-0.15 mm. Seeds ovoid, 0.9-1 × 0.5-0.6 mm. 2n = 40.
Home