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1 October 2015 Phenetic Analyses and Revised Classification of the Ptelea trifoliata Complex (Rutaceae)
Erin Skornia, Muxi Yang, Wendy L. Applequist
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The current classification of Ptelea divides the widespread and highly variable Ptelea trifoliata L. into 5 subspecies and 11 varieties, while additionally terming many specimens “intermediate.” Although there are visually observable differences among regional variants, principal component analyses of quantitative characters failed to separate subspecies or to even incompletely separate most varieties within subspecies. Some recognized subgroups are also not well distinguished by discontinuous qualitative characters. Where multiple varieties appear to be part of a single continuum of variation or are extremely similar, it is suggested that a reduction in the number of infraspecific taxa would improve the utility of the classification. An alternative classification recognizing 5 subspecies and 7 varieties is accordingly proposed.

© 2015
Erin Skornia, Muxi Yang, and Wendy L. Applequist "Phenetic Analyses and Revised Classification of the Ptelea trifoliata Complex (Rutaceae)," Western North American Naturalist 75(4), 406-428, (1 October 2015).
Received: 9 December 2014; Accepted: 1 September 2015; Published: 1 October 2015
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