We've had a lot of treefrogs (Hyla) this summer. I found this one perched on the leaf of an orchid this afternoon.
Another view from an oblique angle:
I had always assumed that these frogs are Hyla versicolor, the grey treefrog. But there is an interesting complication as noted here. H. versicolor has a sibling species Cope's grey treefrog, H. crysoscelis. H versicolor is tetraploid (4n=48) but H. crysoscelis is diploid (2n =24).
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