@ARTICLE{TreeBASE2Ref18571, author = {Joshua M. Brokaw and Larry Hufford}, title = {Phylogeny, introgression, and character evolution of diploid species in Mentzelia section Trachyphytum (Loasaceae)}, year = {2010}, keywords = {}, doi = {10.1600/036364410792495980}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {35}, number = {3}, pages = {601--617}, abstract = {Mentzelia section Trachyphytum (Loasaceae) has 25-30 species found primarily in the western United States. Species delimitation and reconstruction of evolutionary relationships within Trachyphytum have been difficult due to restricted and continuous morphological variation. We employed phylogeny reconstructions based on morphology and DNA sequences from the plastid trnH-psbA, trnS-trnG, trnS-trnfM, ndhF-rpl32, and rpl32-trnL regions and the low-copy nuclear gene idh to investigate evolutionary relationships and patterns of hybridization and homoplasy among diploid species in Trachyphytum. Reconstructions indicated surprisingly high levels of genetic introgression among closely and distantly related diploids. Additionally, reconstructions based on molecular data showed that some morphological characters traditionally used to delineate groups exhibit homoplasy. However, both molecular and morphologically based reconstructions supported two major clades in section Trachyphytum corresponding to the subsection Trachyphyta and a subsection Affines sensu lato comprising taxa previously separated into subsections Affines and Micranthae. Further, this study strengthens assertions that characters apparently shared between the two annual sections of Mentzelia, Trachyphytum and Bicuspidaria, represent homoplasious evolution.} }

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