This book is written for the layman. I found it superficial, but there are annotated suggestions for further reading.
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The Rose's Kiss
The Rose's kiss, although rather strangely titled, offered a very pleasant and thorough description of flower and pollination biology. Peter Bernhardt has a great sense of humor. I have learned and remembered much more from this one book than I have from most of my undergraduate courses in Horticulture. Mr. Bernhardt must be a fantastic lecturer.