Sp. Pl. 1: 1193 (1753); Andersson, Nord. J. Bot. 1: 241-243 (1981).
Rosulate or caulescent marsh plants. Inflorescence an often very richly branched synflorescence; spathes caducous. Florescence component of a single cymule; cymule subbrachyblastic, interphyll and bracteoles absent. Corolla tube obsolete; outer staminode 1, petaloid, showy; callose staminode conspicuously large with narrow petaloid rim; cucullate staminode with two appendages near base of lobe; style helically twisted when triggered, with a very long liplike protrusion from the ventral rim of the stigmatic orifice. Fruit caryopsislike; perisperm canal branched from the base. (From Kubitzki, et al., p. 292)
Found mainly in seasonally humid parts of South America, two species also in southern USA. T. geniculata L. has a widespread population in Africa, and is sometimes regarded as a separate species (cf. Andersson, Nord. J. Bot. 1: 48-56, 1981).
Comprises five to seven species.
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