This rhyming picture book is a cheer for all kinds of vegetables. The back of the book gives a definition for a "vegetable" and includes a short list of vegetables that didn't get in the book, but can be seen on the author's website.
April Pulley Sayre has a sequel out to her vegetable chant. Using the same format, you can see all kinds of fruit, from the everyday to the exotic. There is more information on the back page about what constitutes a "fruit."