Rhizome creeping. Stem erect, unbranched. Leaves 4-9 at the tip of the stem. Flowers solitary, tetra- or more-merous. Perianth segments 8-12, in 2 whorls of unequal series. Stamens as many as the perianth segments; anthers linear. Ovary sub-globose. Fruit a fleshy capsule. Seeds numerous.