Rootstock a corm, rarely a tuber. Leaves few and mainly basal or borne on leafy, sometimes branched, stems. Flowers solitary or in racemes, actinomorphic, bisexual. Perianth in two whorls of 3, connate at the base or free. Stamens 6. Ovary superior, 3-locular. Fruit usually a septicidal capsule. Seeds glabrous.