Getting there
Tree guides on the iPhone and iPod touch just havent come as far along as the bird guides. Some of the best bird guides I have ever seen are apps. They have every imaginable species, advanced search features, gorgeous photos and illustrations, life lists, etc.
This app is the best tree guide in the store, but it still cant compare to the traditional book versions. It has a fairly good amount of species, but still not enough. I know all the basic species in my area, so whenever I find something Im stuck on, I have to take a leaf home and look it up in my big Trees of Canada book because it isnt in here.
However, this app would be perfect for beginners, or for those who are more experienced but are traveling to a new ecozone where theyre not familiar with the species. I will be glued to this app when I travel.
The features and interface are nowhere as nice as the bird guides, but still decent.
EDIT: The iOS4 update deserves an additional star. Lots more trees have been added, at this rate the comprehensiveness will catch up to paper tree guides after a few more updates. It now includes almost all the trees in my area! The pictures have also been sharpened and are now very useful. Definitely the best tree app in the store, and worth the $4 several times over.
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Tree ID - TreeID with Fall Foliage