As for your question, Jeff Randall's site might have some information, you could also sign up for his courses. Backwoods magazine is ok, but is geared heavily toward off the grid living and subsistence, not necessarily identifying wild flora. Try googling some of the more famous authors, (Wiseman, Kochanski, etc.), check out plainsman's cabin. They often have a great deal of cross links that you can get lost in for weeks.

Don't worry about all the name callers on this forum, good luck to you!