Annual, erect, glabrous, branched herb or undershrub; leaves varioualy devided, lower leaves often petiolate with pinnatifid segments, upper ones linear, sessile, or subsessile, nearly entire, glabrous; flowers in long corymbose racemes, small, white or with pink tinge, ebracteate; sepals-4, subequal, inner slightly broad, oblong, obtuse; petals-4, unequal, sometimes absent or shorter than sepals; stamens-6, tetradynamous, sometimes 4 or 2 by abortion; ovary flat with 2 pendulous ovules; style short; stigma capitate; pods broadly elliptic, ovate or oblong, keeled or winged, apex deeply notched, septum narrow, membranous, not veined; seeds solitary in each cell, ovoid-globose, reddish-brown.