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Ptelea trifoliata ssp. trifoliata (Rutaceae) in deciduous forest regions of Eastern North America

Relationships between floral elements of disjunct segments of the mixed mesophytic forest formation in eastern North America were investigated by comparison of populations ofPtelea trifoliata ssp.trijoliata in nine deciduous forest regions, using thin-layer chromatography as a supplement to morphological data. Details of leaf morphology and the presence of certain key spots in Chromatographic patterns visible under ultraviolet light were tabulated for comparison of populations. Similarities were noted between populations of the Appalachian highlands and the mountains of southern Mexico, and between the southeastern United States and the interior. Characteristics ofPtelea populations of glaciated regions indicated floral relationships with vegetation areas on both sides of the Mississippi Valley.