Additional Oak for a Wetland Oak Collection
I plan to add one, and possibly two, species of oaks to an area that is often moist and sometimes flooded. In hot summer months, it's possible for the area to remain dry for some period of time. This area is located in a lower pocket area (so the tree probably needs to be hardy down through zone 6) in East Tennessee. The soil is a good loamy soil and drains fairly well when not under water.
So far, there are some Quercus lyrata, Q michauxii, Q texana, and Q phellos in this area. There are also a few Q macrocarpa not far away. Which Quercus species would you recommend adding to this list to increase diversity? Toughness and dependability are important factors.