Browsing by Author "Lavin, Matt"

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Systematics of Vigna subgenus Lasiospron (Leguminosae: Papilionoideae: Phaseolinae)
(American Society of Plant Taxonomists, 2022-03) Delgado-Salinas, Alfonso; Lavin, Matt; Snak, Cristiane; Lewis, Gwilym P.
A taxonomic treatment is herein provided for the six primarily Neotropical species of Vigna subg. Lasiospron. This subgenus is distinguished, in part, by its close relationship with Old World Vigna species, but rather than having an Old World Vigna floral asymmetry where distal floral parts can have a right-hand curvature (from a face-view perspective), distal parts of Vigna subg. Lasiospron flowers, like those of American Phaseolinae, curve to the left. Our proposed taxonomy reflects published phylogenetic analyses that resolve the Vigna subg. Lasiospron species in a subclade of the primarily Old World clade of species of Vigna sensu stricto. Vigna subg. Lasiospron is therefore distinctive in having a primarily neotropical distribution. Three of the six Vigna subg. Lasiospron species have an amphi-Atlantic distribution, which we suggest was achieved naturally by the ability of these species to disperse and colonize coastal habitats. Nomenclatural and taxonomic synonyms are reported, along with species descriptions and the biogeographical, genetic, and morphological evidence that argues for each of the six Vigna subg. Lasiospron species fitting a unified species concept.
Will Molecular Phylogenetics Help Decrease Nomenclatural Instability?
(Wiley, 2023-08) Lesica, Peter; Lavin, Matt
In the process of compiling a flora for Montana (Lesica, 2012, 2022), we came to realize that many published nomenclatural changes are only weakly supported by the data presented which has often been based on recent findings in the field of molecular evolution. In this essay we attempt to present a summary of the reasons why taxonomic changes may be less than robust and our guidelines for accepting newly proposed nomenclature that we attempted to follow in our work.