Perennial herbs with tuberous rhizome and 1-3 radical leaves only, glabrous, somewhat fleshy. Leaves imparipinnate with usually 6-8 lateral pair of segments and a slightly larger terminal segment, petiolate, somewhat pale and coarsely veined below. Raceme terminal, forkedly branched or panicled, bracteate. Flowers yellowish, regular, hermaphrodite. Sepals 3-6, caducous. Petals 6, flat, longer than sepals with appendiculate nectaries at base. Stamens 6, free, about half as long as the petals; filaments short, anthers oblong, dehiscing by 2 valves above. Ovary 1-carpellary, 1-locular, with 5-6 (-8) basal, orthotropous ovules; style short with disc-shaped, lobed-plicate stigma. Capsule inflated, bladder-shaped, scarious or membranous, with several folds on the wall, dehiscent or opening by the splitting of the wall into several segments above; seeds 1-4 (-6), globose, black, pruinose.