Knowing what I know now, I probably wouldnt have spent so much on this app.
Theres a bug when you try to tag a tree - the app asks to "allow use of location services even when app is not in use" and when you hit dont allow, it freezes and is only fixed by deleting and reinstalling the app. This needs to be fixed, for one, and there also needs to be a way to tag/group trees without engaging location services at all.
I agree about including photos and descriptions of bark types as well, its a whole part of the tree thats been excluded.
I also think there ought to be a question at the beginning of the dichotomous key that asks "does the tree have fruits or flower on it? Or not?" so that users have the option to skip the flower and fruit section if the tree doesnt have them. Bark types need to be included in the questions as well.
Stop-Zombie Time about Arbor Day Tree Identification Guide: What Tree ...