Annual herbs. Hairs simple. Stems erect or ascending, leafy. Lvs 1-2-pinnatifid; lobes linear. Racemes ebracteate. Sepals erect, the inner weakly saccate. Petals pale yellow, with purple veins. Stamens 6, without appendages. Lateral nectaries 2, dumbell-shaped, behind single stamens; median nectaries 2, triangular, between bases of paired stamens. Style short; stigma capitate. Silicle oblong, dehiscent; valves distinctly 3-veined; beak flattened, tongue-like, seedless. Seeds flattened, ovoid to triangular, ridged on margin, 3 per locule.