Two forms of swamp white oak have been described: a mesophytic form with leaves that are green and velvety on the lower surface and a more xerophytic form with leaves that are white-tomentulose beneath. The following six hybrids with swamp white oak are recognized: Quercus x jackiana Schneid. (Q. bicolor x alba); Q. x humidicola Palmer (Q. bicolor x lyrata); Q. x schuettei Trel. (Q. bicolor x macrocarpa) (1); Q. x introgressa P. M. Thomson (Q. bicolor x muehlenbergii x prinoides) (11); Q. x substellata Trel. (Q. bicolor x stellata); Q. x nessiana Palmer (Q. bicolor x virginiana). Swamp white oak also hybridizes with chestnut oak Quercus prinus) and English oak (Q. robur).
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