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DescriptionAquatic herbs. Stipules present. Leaves floating or submerged, alternate or in a rosette, simple (in ours). Flowers in clusters (in ours), generally 5-merous and (in ours) bisexual. Sepals free or ± so. Corolla gamopetalous, lobes membranous, often fimbriate or pilose. Ovary superior, 1-locular with 2(-5) parietal placenta. Fruit capsule, dehiscent or not. Seeds often numerous.