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2019 SINA map
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Weissman & Gray 2019 map
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G. firmus west of the Georgia-Alabama line may be
G. pennsylvanicus instead. These two species hybridize in the Northeast (
Harrison and Bagdanowicz 1997), and their relationships have not been studied along their presumed contact zone in Alabama, Mississippi, Louisiana, and Texas. For more on this uncertainty see "Inconvenient Genes," the
11th image of the
G. firmus species page.