It is a very detailed, thorough, and wide-ranging overview of pollination ecology with oodles of fascinating information about plants, insects, and their interactions. (It also has thorough discussions of pollination by birds, bats, and other mammals...as well as wind and water.)

While it addresses pollination phenomena on a world-wide scale, it is sometimes "British Isles"-centric in the (myriad) examples it presents...though a large proportion of the plant and insect families discussed have analogous representatives in North America.

I highly recommend this book to anyone with a serious interest in plants or insects...and pollination of course. (This is one of the books that got me interested in pursuing the study of insects a few years ago...after having been previously captivated by the study of plants :-)