Glabrous, rhizomatous, more or less scapose perennial herbs with tuberous roots. Leaves mainly basal, distichous, linear. Stem erect, sometimes with a few small leaves. Inflorescence terminal, consisting of 2 subequal, cymose branches. Flowers yellow or reddish. Perianth infundibuliform, the tube shorter than the recurved lobes; veins numerous. Stamens and style curved upwards; filaments inserted on perianth-tube; anthers dorsifixed, introrse. Fruit a loculicidal capsule; seeds rather few.