This is the easiest-to-use and most thorough flower guide I've ever seen. Yes, most illustrations are black-and-white. It's an initial disappointment; however, the quick and sure five-step identification process is worth the lack of color (and the drawings are expertly done). It's much more complete than, say, the Audubon guide. Newcomb has yet to leave me stumped for the identity of any flowering plant. As has been noted, this guide is valid for the Northeast U.S., from Virginia-Kentucky up; and for Canada from Thunder Bay to Newfoundland. I wish the rest of you had a version -- it's indispensible.