An expanded concept of Madisonia including miscellaneous species of Pleurothallidinae (Orchidaceae): Evidence from molecular analysis

• Autor(a) principal: Smidt, Eric De Camargo
• Data de Publicação: 2021
• Outros Autores: Toscano De Brito, A. L.V., Mauad, Anna Victoria Silvério R., Morales, Nicolás Gutiérrez [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.11646/phytotaxa.505.1.5; http://hdl.handle.net/11449/207803
• topic: Anathallis; Neotropics; Pabstiella; Sansonia; Specklinia; Systematics

Prior taxonomic studies in subtribe Pleurothallidinae have suggested a close relationship between miscellaneous species featuring long-repent, segmented rhizomes, abbreviated ramicauls, few-flowered inflorescences, and flowers with partially connate sepals and trilobed lip. The lack of phylogenetic information for most species has prevented further conclusions or changes in their taxonomy; and as a result, they are currently assigned to several unrelated genera: Anathallis, Madisonia, Pabstiella, Pleurothallis, Sansonia and Specklinia. We performed phylogenetic analyses using nuclear (nrITS) and five plastid (matK, psbD-trnT, rps16-trnQ, trnH-psbA and trnS-trnG) markers and demonstrated that these species form an isolated clade which requires generic recognition. The name Madisonia, previously a monotypic genus endemic of the Amazon basin, is re-circumscribed and expanded to include nine species distributed in the Atlantic Rainforest and the Caribbean. Eight new nomenclatural combinations are proposed.