Submerse aquatic herbs; rhizome creeping, monopodial, with 2 vascular bundles; at each node 1-several roots and a short erect stem bearing 1– 4 leaves. Leaves with sheath, semi-persistent, when shed leaving circular scar; blade linear, entire, narrowed at base, with 3 veins and conspicuous midrib which is widened or furcate at apex. Flowers solitary and terminal, enclosed in a leaf similar to others; bud in axil of penultimate leaf develops into prolongation of main axis giving rise to a sympodium; staminate flower subsessile; carpellate flowers subsessile. Fruit subglobose-ovoid, shortly beaked, ± compressed, with stony pericarp. Worldwide: 6 species, pantropical. Tanzania: 0 taxa. |
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