Two new species of Perymenium (Compositae-Heliantheae) from the arid part of the state of Queretaro (México)

Perymenium arriagae and P. sotoarenasii are described and illustrated as new species from central Queretaro. Both are shrubs of xerophilous habitat and habit, and are known from scarce collections, in spite of the fact that the area has been fairly intensively explored. Seemingly the two species are...

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