Polyphyly of Mesadenus (Orchidaceae, Spiranthinae) and a New Genus from the Espinhaço Range, Southeastern Brazil
Por:
Salazar G.A., Batista J.A.N., Meneguzzo T.E.C., Cabrera L.I., Figueroa C., Calvillo-Canadell L., Vale A.A.D., Jiménez-Machorro R.
Publicada:
1 ene 2019
Resumen:
Mesadenus displays an odd disjunction, with most species found in the southeastern USA, the Caribbean, and Mexico south to El Salvador, and two outliers occurring in southeastern Brazil. A recent molecular phylogenetic study showed that, as currently delimited, Mesadenus is polyphyletic, and further study of this little-known genus is required. Here we assessed relationships in Mesadenus and to other genera conducting a cladistic parsimony analysis of nucleotide sequences of nuclear (ITS) and plastid (matK-trnK, trnL-trnF) DNA for an enlarged sample of taxa, including five out of six currently accepted species of Mesadenus and representatives of nearly all (36 out of 41) genera of Spiranthinae, plus suitable outgroups. A detailed comparison of vegetative and floral attributes of relevant taxa was also conducted. Our results confirm the polyphyly of Mesadenus and support the creation of a new genus, Espinhassoa, to include Brazilian Mesadenus' glaziovii and M.' rhombiglossus (as Espinhassoa glaziovii and E. rhombiglossa, respectively). An identification key, descriptions, and illustrations of the two species herein included in Espinhassoa are provided. © 2019 by the American Society of Plant Taxonomists.
Filiaciones:
Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, Apartado Postal 70-367, Mexico City, 04510, Mexico
Universidade Federal de Minas Gerais, Departamento de Botânica, Av. Antônio Carlos 6627, Belo Horizonte, Minas Gerais, 31270-910, Brazil
Instituto de Pesquisas Jardim Botânico Do Rio de Janeiro, Rua Pacheco Leão 915, Jardim Botânico, Rio de Janeiro, Rio de Janeiro, 22460-030, Brazil
Herbario UACJ, Instituto de Ciencias Biomédicas, Departamento de Ciencias Biológicas, Universidad Autónoma de Ciudad Juárez, Av. Benjamin Franklin 4650, Ciudad Juárez, Chihuahua, 32310, Mexico
Herbario AMO, Montañas Calizas 490, Lomas de Chapultepec, Mexico City, 11000, Mexico
|