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Genus :


Family :



Perennial, marshy or aquatic herbs with creeping rhizomes. Leaves erect, linear, distichous, usually spongy, margin entire, sheathed at base. Inflorescence a terminal, cylindric spike, bearing numerous, minute, densely crowded unisexual flowers with lower part female, upper part male. Perianth absent. Male flowers: consisting of 1-3 stamens, connate, filaments short, anthers 2-thecous, basifixed, longitudinally dehiscent. Female flowers: carpel 1, ovary fusiform on gynophore, styles capillary, stigmas broadened or spatulate, ovule 1. Fruit follicle, minute, fusiform, falling off together with stalk.

Key to the species

Serial Key Reference
1a. Leaves dorsally keeled; bracteoles linear, pollen 4-globate T. elephantiana
1b. Leaves dorsally convex; bracteoles filiform to triangular, pollen simple T. domingensis