Monotrema is a group of plants in the family Rapateaceae described as a genus in 1872.Tropicos, Monotrema Körn.Körnicke, Friedrich August. 1872. Linnaea 37: 475-480 in Latin
The genus is native to northern South America.Kew World Checklist of Selected Plant FamiliesFunk, V. A., P. E. Berry, S. Alexander, T. H. Hollowell & C. L. Kelloff. 2007. Checklist of the Plants of the Guiana Shield (Venezuela: Amazonas, Bolivar, Delta Amacuro; Guyana, Surinam, French Guiana). Contributions from the United States National Herbarium 55: 1–584
species Monotrema aemulans Körn - Venezuela (Amazonas), Guyana, Brazil (Amazonas, Mato Grosso) Monotrema × affine Maguire - Venezuela (Amazonas) Monotrema arthrophyllum (Seub.) Maguire - Colombia (Vaupés, Caquetá) Monotrema bracteatum Maguire - Colombia (Guainía), Venezuela (Amazonas, Bolívar) Monotrema xyridoides Gleason - Venezuela (Amazonas), Colombia (Caquetá), Brazil (Amazonas, Roraima)
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