Herbs annual, 5-25 cm tall. Stems decumbent, branched primarily at or near base, pubescent with subsessile stellate trichomes rarely mixed with simple ones, rarely glabrous distally. Basal leaves withered by anthesis; cauline leaves 2-6(-10), sessile, not auriculate; leaf blade ovate to elliptic, 1-3.5 X 0.4-1.5 cm, abaxially pubescent with subsessile or shortly stalked, 4-rayed, stellate trichomes with simple rays, adaxially with subsetose simple or long stalked forked trichomes sometimes mixed with fewer, smaller, 4-rayed stellate ones, base cuneate, margin 3-5-toothed on each side, apex acute. Racemes 8-20-flowered, ebracteate, elongated in fruit; rachis straight; fruiting pedicels 5-15 mm, horizontal, straight, pubescent all around, or rarely glabrescent. Sepals oblong, 1-1.3 X 0.6-0.8 mm, erect, abaxially pilose with stellate trichomes, base of lateral pair not saccate, margin membranous. Petals yellow, spatulate, 1.2-1.6 X 0.5-0.6 mm, apex retuse, obscurely clawed at base. Filaments 0.8-1 mm; anthers ovate, 0.1-0.2 mm. Ovules 14-20 per ovary. Fruit oblong, 8-10(-12) X (2.5-)3-3.5 mm, often horizontal, latiseptate, not twisted; valves sparsely puberulent with simple and subsessile forked trichomes, rarely glabrescent, obscurely veined, base and apex acute; style obsolete, rarely to 0.1 mm. Seeds brown, ovate, 1-1.3 X 0.7-0.9 mm. Fl., fr. Aug.
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