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DescriptionPerennial aquatic herbs (in ours), often rooting from the lower nodes. Inflorescence terminal, glandular-pubescent. Flowers zygomorphic, bisexual. Sepals 3, free. Petals 3, deliquescent, equal or unequal, purple to pink. Stamens 6, fertile, 3 upper different from the 3 lower. Filaments glabrous. Ovary 2-locular, glabrous. Capsule glabrous.