on the Pacific slopes of Mexico. The new species is illustrated, and its affinities are discussed... more on the Pacific slopes of Mexico. The new species is illustrated, and its affinities are discussed. The novelty is related to L. straminea (Bateman ex Lindley) Braem, but the labellum isthmus is broader (to 3 mm wide), the claw of the dorsal sepal is very short (1.5 mm long) and wide, and the callus is 8partite (vs. 5-partite in L. straminea).
A synopsis of the genus Cohniella is presented with nomenclatural updates with a discusion of dia... more A synopsis of the genus Cohniella is presented with nomenclatural updates with a discusion of diagnostic features and biogeographical data. Thirteen species and one natural hybrid are recognized. Two new species, Cohniella pendula and Cohniella biorbicularis, are described and illustrated. The following four new combinations are proposed: Cohniella binotii, Cohniella brachyphylla, Cohniella cepula, and Cohniella longifolia. Lectotypes are selected for Oncidium subulifolium, Oncidium helicanthum, Oncidium humboldtii, Oncidium jonesianum var. phaeanthum, Oncidium cepula, and Oncidium wittii. We also propose an amended lectotype for Epidendrum cebolleta and several epitypifications and new synonyms. A key to the genera of the Trichocentrum complex is presented (Appendix) as well as keys to the species of Cohniella. Se presenta una sinopsis del género Cohniella, con actualizaciones nomenclaturales y discusiones de caracteres diagnósticos y datos biogeográficos. Se aceptan 13 especies y un híbrido natural en el género. Dos especies nuevas, Cohniella pendula y Cohniella biorbicularis, se describen e ilustran. Se proponen las siguientes combinaciones nuevas: Cohniella binotii, Cohniella brachyphylla, Cohniella cepula y Cohniella longifolia. Se seleccionan lectotipos para Oncidium subulifolium, Oncidium helicanthum, Oncidium humboldtii, Oncidium jonesianum var. phaeanthum, Oncidium cepula y Oncidium wittii. También proponemos una modificación a la lectotipificación de Epidendrum cebolleta y varias epitipificaciones y nuevos sinónimos. Se presenta una clave para los géneros del complejo Trichocentrum en un apéndice, así como una clave para las especies de Cohniella.
CETZAL IX (El Colegio de la Frontera Sur, Unidad Chetumal, Chetumal, Quintana Roo 77000, México),... more CETZAL IX (El Colegio de la Frontera Sur, Unidad Chetumal, Chetumal, Quintana Roo 77000, México), J. L. TAPIA-MUÑ OZ AND I. M. RAMíREZ (Herbario CICY, Centro de Investigació n Científica de Yucatán, Mérida, Yucatá n 97200, Mexico). A reappraisal of the turtle-orchids, genus Chelyorchis (Oncidiinae: Orchidaceae): Molecular, phylogenetic, and morphometric approaches. J. Torrey Bot. Soc. 136: 164-185. 2009.-A review of live, herbarium, and bibliographic material of Chelyorchis revealed considerable floral variation that appears to be geographically correlated. We assessed whether the genus included one or more taxonomic entities using a morphometric analysis that involved the study of principal component analysis across several floral characters in 70+ specimens, representing both geographical range and morphological variation. To further establish the phylogenetic relationships of Chelyorchis within the Cuitlauzina-clade, and to analyze the evolution of relevant characters, we performed a combined analysis using nrITS, morphological, and gapcoding data, which included only 13 species. Both of our phylogenetic analyses strongly support the genus Chelyorchis as a monophyletic entity that is sister to a clade comprised of the genera Ticoglossum and Rossioglossum. The morphometric evidence strongly suggests that two taxa at the level of species should be recognized, differing primarily in the shape and proportions of the labellum but also in their geographical distribution. A new species, Chelyorchis pardoi, is described and illustrated to accommodate the South American morph. Full description of the new species and iconography of both taxa are provided, and diagnostic features are discussed. The conservation status of the new taxon is assessed against IUCN criteria.
on the Pacific slopes of Mexico. The new species is illustrated, and its affinities are discussed... more on the Pacific slopes of Mexico. The new species is illustrated, and its affinities are discussed. The novelty is related to L. straminea (Bateman ex Lindley) Braem, but the labellum isthmus is broader (to 3 mm wide), the claw of the dorsal sepal is very short (1.5 mm long) and wide, and the callus is 8partite (vs. 5-partite in L. straminea).
A synopsis of the genus Cohniella is presented with nomenclatural updates with a discusion of dia... more A synopsis of the genus Cohniella is presented with nomenclatural updates with a discusion of diagnostic features and biogeographical data. Thirteen species and one natural hybrid are recognized. Two new species, Cohniella pendula and Cohniella biorbicularis, are described and illustrated. The following four new combinations are proposed: Cohniella binotii, Cohniella brachyphylla, Cohniella cepula, and Cohniella longifolia. Lectotypes are selected for Oncidium subulifolium, Oncidium helicanthum, Oncidium humboldtii, Oncidium jonesianum var. phaeanthum, Oncidium cepula, and Oncidium wittii. We also propose an amended lectotype for Epidendrum cebolleta and several epitypifications and new synonyms. A key to the genera of the Trichocentrum complex is presented (Appendix) as well as keys to the species of Cohniella. Se presenta una sinopsis del género Cohniella, con actualizaciones nomenclaturales y discusiones de caracteres diagnósticos y datos biogeográficos. Se aceptan 13 especies y un híbrido natural en el género. Dos especies nuevas, Cohniella pendula y Cohniella biorbicularis, se describen e ilustran. Se proponen las siguientes combinaciones nuevas: Cohniella binotii, Cohniella brachyphylla, Cohniella cepula y Cohniella longifolia. Se seleccionan lectotipos para Oncidium subulifolium, Oncidium helicanthum, Oncidium humboldtii, Oncidium jonesianum var. phaeanthum, Oncidium cepula y Oncidium wittii. También proponemos una modificación a la lectotipificación de Epidendrum cebolleta y varias epitipificaciones y nuevos sinónimos. Se presenta una clave para los géneros del complejo Trichocentrum en un apéndice, así como una clave para las especies de Cohniella.
CETZAL IX (El Colegio de la Frontera Sur, Unidad Chetumal, Chetumal, Quintana Roo 77000, México),... more CETZAL IX (El Colegio de la Frontera Sur, Unidad Chetumal, Chetumal, Quintana Roo 77000, México), J. L. TAPIA-MUÑ OZ AND I. M. RAMíREZ (Herbario CICY, Centro de Investigació n Científica de Yucatán, Mérida, Yucatá n 97200, Mexico). A reappraisal of the turtle-orchids, genus Chelyorchis (Oncidiinae: Orchidaceae): Molecular, phylogenetic, and morphometric approaches. J. Torrey Bot. Soc. 136: 164-185. 2009.-A review of live, herbarium, and bibliographic material of Chelyorchis revealed considerable floral variation that appears to be geographically correlated. We assessed whether the genus included one or more taxonomic entities using a morphometric analysis that involved the study of principal component analysis across several floral characters in 70+ specimens, representing both geographical range and morphological variation. To further establish the phylogenetic relationships of Chelyorchis within the Cuitlauzina-clade, and to analyze the evolution of relevant characters, we performed a combined analysis using nrITS, morphological, and gapcoding data, which included only 13 species. Both of our phylogenetic analyses strongly support the genus Chelyorchis as a monophyletic entity that is sister to a clade comprised of the genera Ticoglossum and Rossioglossum. The morphometric evidence strongly suggests that two taxa at the level of species should be recognized, differing primarily in the shape and proportions of the labellum but also in their geographical distribution. A new species, Chelyorchis pardoi, is described and illustrated to accommodate the South American morph. Full description of the new species and iconography of both taxa are provided, and diagnostic features are discussed. The conservation status of the new taxon is assessed against IUCN criteria.
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