this is really handy book..mostly because it covers lots of the "weeds" that most folks don't consider wildflowers...lots of the stuff that grows in fencerows and roadsides... I'm still dragging around a 1972 copy.....

http://www.amazon.com/Guide-Full-Color-Wildflowers-Weeds/dp/0442217048/ref=sr_11_1/104-5104488-1083913?ie=UTF8&qid=1181860620&sr=11-1

Holy Moly - I just saw what a price on good condition 1972 printing was going for on amazon $58.00....Yikes!..mine still has a 6.95 price tag on it from SIU's bookstore!

I'd say by the looks of this...I'd probably enjoy your library!