@ARTICLE{TreeBASE2Ref2149, author = {Craig F. Barrett and John V. Freudenstein}, title = {Patterns of morphological and plastid DNA variation in the Corallorhiza striata species complex (Orchidaceae).}, year = {2008}, keywords = {}, doi = {}, url = {}, pmid = {}, journal = {Systematic Botany}, volume = {}, number = {}, pages = {}, abstract = {Corallorhiza striata is a wide-ranging, morphologically variable, mycoheterotrophic orchid complex distributed across North America. Objectives of this study were to assess relationships and test validity of previously delimited varieties of C. striata and the recently described C. bentleyi. Two plastid DNA regions were sequenced for individuals from several populations across North America, identifying four major clades. The large-flowered C. striata var. striata (northern U.S.A., southern Canada) was sister to the smaller-flowered var. vreelandii (southwestern U.S.A., Mexico), and these were sister to a Californian clade with relatively intermediate-sized flowers. C. striata var. involuta (Mexico) and the endangered C. bentleyi (eastern U.S.A.) shared a very close relationship, sister to the remaining C. striata. Principal Components Analysis and Nonparametric Multivariate Analysis of Variance on nine quantitative morphological characters, using plastid DNA clades as independent variables, demonstrated strong correlations. Morphological analyses supported differentiation of both C. striata var. involuta and C. bentleyi relative to all other accessions of C. striata, suggesting their recognition as separate species; these findings will have future implications for conservation. The biogeographic scenario was more complex than previously thought, with members of two major plastid DNA lineages (C. bentleyi/var. involuta and the remaining C. striata) existing in Mexico and U.S.A./ Canada. These findings contribute to a burgeoning body of data on poorly studied plant groups sharing Mexican-northern North American geographic distributions.} }

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