I've been interested in wildflowers my whole life. For wildflower identification I rely on:
Elliman, Ted, Wildflowers of New England, Timber Press, 2016.
Carter, Kate, Wildflowers of Vermont (2nd ed.) Cotton Brook, 2005.
Dwelley, Marilyn, Summer & Fall Wildflowers of New England (2nd ed.) Down East Books, 2004
National Audubon Society Field Guide to Wildflowers, Eastern Region, (Revised ed.) Knopf, 2001
Venning, Frank, Guide to Field Identification, Wildflowers of North America, Golden Books 1984.