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).
- Burns, Russell M., and Barbara H. Honkala, technical coordinators. 1990. Silvics of North America: 1. Conifers; 2. Hardwoods. Agriculture Handbook 654 (Supersedes Agriculture Handbook 271,Silvics of Forest Trees of the United States, 1965). U.S. Department of Agriculture, Forest Service, Washington, DC. vol.2, 877 pp. http://www.na.fs.fed.us/spfo/pubs/silvics_manual/table_of_contents.htm
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