Perennial herbs, with rhizomes. Leaves distichous, mostly basal. Stems terete to flattened, often strongly winged. Inflorescences composed of 2-nate rhipidia, these 1-many. Flowers actinomorphic, blue, lasting one morning only, twisting spirally as they go over, deliquescent. Tepals free ± to base, spreading horizontally. Fruit a capsule.
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