David Butler wrote about a field trip he took to the NJ Pine Barrens where he
discovered the plants in CPN I think in one of the 1985 volumes or so, I will
have to look it up. In the meanwhile, I visited the site and found a few
more. It seems this hybrid is very common (we found it all over the place),
and it is very easy to pick out. Its sheer size is very impressive. We found
plants with 4-5 inches in diameter! They were absolutly huge!
Christoph