Annual herb. Indumentum of appressed medifixed bifid hairs. Flowers very small, white, in dense racemes ; fruiting racemes up to 14 cm long, terminating all primary and secondary branches. Sepals about 1.5 mm long. Petals hardly longer than sepals. Fruit a linear, rather tetragonous siliqua up to 10 mm long, and 2 mm broad, torulose. Valves keeled, each ending in a short divergent horn.