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" We establish that Abronia vasconcelosii is a junior synonym of A. aurita. Abronia fimbriata is resurrected from the synonymy of A. aurita and shown to be one of the most distinctive species in the genus. Abronia gaiophantasma and A. anzuetoi are described, respectively, from the cloud forest of the western Sierra de las Minas, Department of Baja Verapaz, Guatemala, and the southern (Pacific) slope of the Volcán de Agua, Department of Escuintla, Guatemala. These species had previously been confused with A. aurita and'A. vasconcelosii,'Respectively. Abronia smithi, a new species from the Pacific versant of Chiapas, Mexico, and A. leurolepis, a new species from the Atlantic versant of Chiapas, Mexico, are described and distinguished from A. ochoterenai, from the Atlantic versant of Chiapas, Mexico, with which they had previously been confused. A more detailed diagnosis of A. matudai, of the Pacific versant of Guatemala and Chiapas, Mexico, is provided. Abronia kalaina is placed in the synonymy of A. fuscolabialis, and specimens previously reported as A. montecristoi from Honduras are shown to be representatives of A. salvadorensis. We address the taxonomic history and provide synonymies and diagnoses for each of the problematical species. The natural history, conservation biology, and phylogeny of Abronia are discussed. The use of intraspecifically variable characters in phylogenetic inference is addressed and alternative approaches to analysis are compared:(1) a reference approach in which only'fixed'characters are employed (ie, all transformation series that contain polymorphic cells in the data matrix are excluded);(2) a'baseline …