Madisonia, synonym Sansonia, is a genus of flowering plants in the family Orchidaceae, native to Jamaica, Trinidad and Tobago, and tropical South America. The genus was established by Carlyle A. Luer in 2004.
Species , Plants of the World Online accepted the following species: Madisonia articulata (Lindl.) Toscano & E.C.Smidt Madisonia bradei (Schltr.) Toscano & E.C.Smidt Madisonia brasilica (Luer & Toscano) Toscano & E.C.Smidt Madisonia carrisii (Brade) Toscano & E.C.Smidt Madisonia gomesii-ferreirae (Pabst) Toscano & E.C.Smidt Madisonia ianthina (E.M.Pessoa & F.Barros) Toscano & E.C.Smidt Madisonia kerrii (Braga) Luer Madisonia spiculifera (Lindl.) Toscano & E.C.Smidt Madisonia vandenbergii (Chiron) Toscano & E.C.Smidt
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