(Vol. 05, 2002-12) A New Species of Polygala (Polygalaceae) from Tamaulipas, Mexico, with Notes on the Polygala Nudata Complex
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Polygala madrensis is described as a new species from the Sierra Madre Oriental of southwestern Tamaulipas, Mexico. The new species is most closely related to P. nudata. All five species of the P. nudata complex, including P. madrensis, are shown to be diploid with n = 9. A key to the five species is presented and their geographical ranges summarized.