Herbs annual or perennial with woody base. Trichomes sessile, 10–18-rayed stellate, without webbing between slender rays, those on leaves not umbonate, simple trichomes present or absent. Multicellular glands absent. Stems erect to ascending, sometimes prostrate, simple, leafy, not spiny. Basal and lowermost stem leaves short petiolate, not rosulate, simple, entire or distally denticulate; cauline leaves subsessile, cuneate to attenuate, not auriculate at base, entire or denticulate. Racemes 2-many flowered, ebracteate, corymbose, elongated in fruit; rachis straight; fruiting pedicels divaricate or recurved, sometimes straight, pubescent, persistent. Sepals ovate, free, deciduous, erect, pubescent, equal, base of lateral pair not saccate; petals yellow, erect, shorter than or subequaling sepals; blade obovate to oblanceolate, glabrous, apex retuse; claw hardly differentiated from blade, glabrous, unappendaged, entire; stamens 6, included, erect, subequal; filaments wingless, toothless, unappendaged, glabrous, free; anthers ovate or oblong, not apiculate; nectar glands 4, lateral, cylindrical, 1 on each side of lateral stamen; ovules 4 per ovary; placentation subapical. Fruit dehiscent, capsular silicles, obovate, latiseptate, not inflated, unsegmented; valves papery, veinless or with an obscure midvein, pubescent outside or glabrous with papillate margin, not keeled, smooth, wingless, unappendaged; gynophore absent; replum rounded, visible; septum complete, membranous, veinless; style 0.5–1 mm long, cylindric, persistent; stigma capitate, entire, unappendaged. Seeds aseriate, usually 1 per locule, narrowly winged, ovate, flattened; seed coat smooth, not mucilaginous when wetted; cotyledons accumbent.