Ok. Here's a possibility. Granted, it might be a long shot especially because I'm not familiar with the park. But many if not most parks have horticulturalist(s), whatever their title might be, who could help. I'd start by calling them and stating your dilemma in trying to identify a tree. Tell them that you could email pictures. If you saw it at a notable place within the park, like Observation Point X, or 'about x miles on trail y', add that info. You might be surprised. There's someone who has to keep track of the trails, looking for downed trees, etc. So give it a try. Can't hurt. Might help. Ya never know.
