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DescriptionLeaves floating, deeply cordate at base.. Inflorescence compound, pyramidal, consisting of whorls of 3 branches or 3 flowers, subtended by 3 lanceolate bracts and 2 or 3 smaller bracteoles. Flowers bisexual. Sepals 3, spreading. Petals 3. Stamens 6. Carpels 10-15 (in ours). Achenes spirally arranged, spongy.