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DescriptionPerennial herbs, dying back each year, with corms. Inflorescence a spike. Floral bracts green or membranous above; the inner smaller than the outer. Flowers actinomorphic, usually white or pink, opening in the evening; tepals subequal, spreading or cup-shaped, united below into a straight or curved tube. Stamens symmetrically arranged. Style dividing at the mouth of the perianth tube into 3 large spreading branches. Fruit a capsule, sometimes dehiscing only in upper third. Seeds sometimes slightly winged.