Herbs annual. Trichomes sessile, (6–)8–16-rayed stellate with rigid, appressed rays without webbing, sometimes simple setose trichomes and/or minute papillae present on fruit. Multicellular glands absent. Stems erect to ascending or decumbent, simple or several from base, branched upward, leafy, not spiny. Basal leaves petiolate, not rosulate, simple, entire; cauline leaves petiolate or subsessile, cuneate to attenuate, not auriculate at base, entire. Racemes several to many flowered, ebracteate, corymbose, elongated considerably in fruit; rachis straight; fruiting pedicels ascending to divaricate, persistent. Sepals ovate, free, deciduous or rarely persistent, erect to ascending, equal, base of lateral pair not saccate; petals pale yellow to gold, erect throughout or at base and with flaring blade, subequaling or longer than sepals; blade obovate to spatulate or oblanceolate, apex obtuse, retuse, emarginate, or deeply 2-lobed; claw slightly differentiated from blade or not, shorter than sepals, glabrous, unappendaged; stamens 6, slightly exserted, erect, slightly tetradynamous; filaments with winged appendages, glabrous, free; anthers ovate, not apiculate; nectar glands 4, lateral, 1 on each side of lateral stamen, median glands absent; ovules 4–8(–16) per ovary; placentation parietal or very rarely subapical. Fruit dehiscent capsular silicles, ovate, obovate, elliptic, or orbicular, strongly latiseptate, not inflated, unsegmented; valves papery, veinless, glabrous or with simple subsetose trichomes and/or puberulent with minute papillae, not keeled, smooth, wingless, unappendaged; gynophore absent; replum rounded, visible; septum complete, membranous, veinless; style (0.1–)0.5–2.5 mm long, filiform, persistent; stigma capitate, entire, unappendaged. Seeds biseriate, winged or wingless, ovate, flattened; seed coat mucilaginous when wetted; cotyledons accumbent.