Sidenote #2: No, I still don't have specific geographical locations listed for each plant. I haven't come up with a simple way of doing this which wouldn't break copyright laws.
As long a you're not making any money and the information is for educational purposes only, reference information from other publications can usually be cited in footnotes as long as it's not a copied word for word reproduction. You can also use information or redraw maps if the information comes from several sources.