Annual or biennial, 15-30 cm tall, erect, branched mostly above, subhairy below with simple hairs, glabrous or subglabrous above. Leaves dimorphic; lower leaves bipinnatisect, 5-10 cm long, 1.5-2.5 cm broad, short stalked; lobes narrowly linear, short, acute; middle and upper leaves ovate-cordate, sessile, amplexicaul, 1-1.5 cm long, 1-2 cm broad, entire, acute; all leaves somewhat fleshy, ± glabrous. Racemes 30-70-flowered, ebracteate, up to 8 cm long in fruit. Flowers small, c. 2 mm across, pale yellow; pedicel up to 7 mm long in fruit, filiform, spreading or ascending. Sepals c. 1 mm long, 0.6 mm broad, oblong, obtuse. Petals c. 1.7 mm long, 0.5 mm broad, oblong-spathulate, clawed, apex rounded. Stamens 6, c. 1: 1.4 mm long with minute anthers. Siliculae 3-4 mm in diam., suborbicular or broadly elliptic, slightly winged and notched at the apex; style short with capitate stigma slightly protuding out of the notch; valves thin, obscurely winged; septum c. 1 mm broad; seed c. 2 mm long, ovate-oblong, reddish brown.