Herbs with underground bulbs or rhizome. Flowers regular, bisexual, in terminal cymose umbels with a scariose spathe, often 2-valved. Perianth segments 6, free or connate. Stamens 6, adnate to the perianth at the base. Ovary superior, 3-locular; style simple, capitate or 3-lobed. Fruit a capsule. c. 13 gen., mostly N. temp.