That second tree that was correctly identified as a post oak is in the "white oak family" as are chestnout oak, overcup, ect...
The "Pin Oaks" - water oak, nutall, willow shumard ect... are all in the "red oak" family. It takes their acorns two years to mature so they are more reliable as deer food than white oaks which mature in one year and are more susceptible to yearly drought and other environmental factors. A good rule of thumb when thinning timber or planting trees is leave two red oaks for every white oak.
Post Oaks have the "cross shaped leaves". I am getting a little rusty since its been 25 years since those Dendrology classes at SFA but I am pretty sure the above answers are right.
The picture of the red oak illustrates the differences in the red oak and white oak families. The red oaks have that little bitty pin at the very end of the leaves, and that's obvious in that photo. That is not obvious in the other photos, so they're members of the white oak family.
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Thats the quickest way to know which family your looking at.
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