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Genus :


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Species of this Genus


Submerged, dioecious herbs. Stems elongated, slender, much branched. Leaves alternate but usually opposite basally, densely crowded above, linear, slightly sheathing at base, margin minutely serrulate with teeth. Male inflorescences many flowered, pedunculate, spathe bifid at apex. Male flowers: minute; sepals 3, petaloid, white, ovate; petals 3, small, subequal to sepals; stamens 2 or 3, opposite to sepals, filaments slender, very short. Female spathe oblong, 1-flowered, female flowers similar to male ones, ovary oblong, beaked, styles 3. Fruits ovoid-oblong or linear. Seeds oblong, numerous.