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Q. macrocarpa buds are very distinct with little.....well, burs on the terminal buds. Epidemic twigs are not good for ID as they can be variable. Is that where the leaves are from?
 
the Twigs are not always as corkey as we would like them to be.... But yes the acorns are pretty distinctive. We'll look at this again From the home computer later tonight.
 
chizmin said:
Here are some pictures from a colleague of a Q. alba and Q. macrocarpa bud. The main differences I see are usually more bud scales on Q. alba, usually a bit smaller on Q. alba, Q. macrocarpa sometimes a bit more conical, twig is stouter on Q. macrocarpa.

@ATH I don't see the burs you are talking about? Are you referring to the stipule like threads that are on the buds sometimes? I've seen those on Q. macrocarpa and Q. bicolor. I did not find any on the twigs of this oak.
Click to expand...
Yes...the stipules. I don't know that I've ever seen a Bur oak without.

I think those acorns were probably aborted, so they aren't very helpful. Hybrid is certainly a strong possibility. that second leaf looks like it could have some Q. bicolor shape in it... maybe a bicolor/alba hybrid? Would hybrids struggle to produce successful seeds???
 
Q x bebbiana is alba x macrocarpa.
It's pretty common and intermediate characteristics.
I don't think sterility is an issue at all. In fact there are lots of back crossing as well.
 
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