@ARTICLE{TreeBASE2Ref17214, author = {Erin T. Riley-Hulting and Alfonso Delgado-Salinas and Matthew T. Lavin}, title = {Phylogenetic systematics of Strophostyles (Fabaceae): a North American temperate genus within a neotropical diversification.}, year = {2004}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {}, number = {}, pages = {}, abstract = {A combined parsimony analysis of cpDNA trnK, nrDNA ITS/5.8S, and morphology reveals that the genus Strophostyles is indeed monophyletic and comprises three species centered in eastern North America. In contrast to the conventional view of the geographic relationships of eastern North America, Strophostyles is nested within a primarily neotropical group. However, its sister is the South American genus Dolichopsis, which is endemic to the Chaco, a region characterized by having an annual frost interval. Strophostyles is apomorphically diagnosed by divergent stipules, persistent secondary floral bracts, calyces with four acute to sometimes attenuate lobes, and seed testae often with a cellular coat. Its sister relationship with Dolichopsis is supported in part by a shared keel petal morphology involving a gibbous ventral margin proximal to the rostrum. The three traditionally recognized species of Strophostyles are phenotypically and genetically distinct. Strophostyles peduncularis is the most genetically variable at the ITS locus and has a geographical distribution centered in southern Appalachia. The geographically most widespread S. helvolus shows the least amount of intraspecific genetic variation at this locus, suggesting recent and rapid range expansion throughout eastern North America. Nucleotide sequence variation is intermediate in Strophostyles leiosperma, a species distributed primarily in central North America.} }

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