Abstract
The distribution of two closely related species, Delphinium treleasei Bush ex Davis and D. alabamicum Kral, is correlated with surface exposures of particular geologic formations. Delphinium treleasei is found only in northwestern Arkansas and southwestern Missouri, and its distribution closely follows the exposure of an upper member of the Ordovician Cotter dolomite. Exposures of the Mississippian Bangor limestone in northwestern Alabama provide habitats for populations of D. alabamicum. Not only are the two species similar in morphology; the geologic formations are similar in mineralogy and geologic history. The most likely explanation for the vicariant distribution of these taxa is parallel evolution.
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