Herbs annual, (5-)12-45(-50) cm tall. Stems solitary or few from base, erect, simple or few branched near base, densely hirsute basally with subsetose simple trichomes to 1.5 mm, these rarely mixed with fewer, smaller, stalked forked trichomes, glabrous along distal half. Basal leaves rosulate, subsessile; leaf blade oblong-obovate to narrowly oblong, (0.5-)0.8-3.5(-4.2) cm × 2-8(-12) mm, abaxially densely subhirsute with long-stalked, 3-or 4-rayed stellate trichomes with simple rays, sometimes with a few simple trichomes, adaxially with predominantly simple trichomes mixed with fewer, stalked forked ones, base cuneate, margin entire or 1-3-toothed, ciliate with simple trichomes, apex subobtuse. Cauline leaves 2-5(-7), sessile, oblong-ovate to oblong lanceolate, with indumentum similar to basal leaves, margin entire or minutely 1-3-toothed, apex obtuse to subacute. Racemes (4-)10-50(-60)-flowered, ebracteate, elongated considerably in fruit; rachis straight. Fruiting pedicels (0.1-)0.5-1.8(-2.5) cm, divaricate, slightly curved upward or straight, slender, glabrous. Sepals ovate-oblong, 1.5-2 × ca. 1 mm, erect, abaxially hirsute with simple trichomes, base of lateral pair not saccate, margin narrowly membranous. Petals yellow, spatulate, 3-4 × 1-1.5 mm, apex subemarginate. Filaments 1.5-2 mm; anthers ovate, 0.2-0.3 mm. Ovules (32-)38-48 per ovary. Fruit linear, (0.6-)0.9-2(-2.5) cm × 1.5-2.5 mm, not inflated, latiseptate, not twisted, straight or slightly curved; valves antrorsely puberulent with simple trichomes rarely mixed with forked ones, very rarely glabrous, with obscure midvein, base and apex subobtuse; style 0.1-0.2 mm. Seeds brown, ovate, 0.7-1 × 0.4-0.5 mm. Fl. and fr. Jun-Aug.
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