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Note the leaf's glabrous underside and the pubescent petiole. Both are A. saccharum and A. Nigrum characteristics, respectively (for juvenile A. saccharum leaves, which later become glaucous). As well, the leaf shape with sharp angles in the two sinuses flanking the central lobe are more acute than typically found in A. nigrum but are typical of A. saccharum.

These intermediate features suggest to me that this is a hybrid of the two species, but there is no taxon in iNaturalist for the cross species. Any suggestions for IDing this?