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DescriptionPerennial rhizomatous herbs. Leaves generally 2-ranked, usually with a well-developed winged sheath and false petiole; lamina pinnately veined. Inflorescence a spike raceme or head. Flowers bisexual, asymmetric. Calyx of 3 sepals. Corolla 3-lobed, united in a tube below. Fertile stamen 1, with several, variously petaloid, staminodes. Ovary inferior. Fruit fleshy or a capsule.