This new edition features more than 300 new photos. Unlike the previous edition, where photos are bunched up in a four-color section in the middle, this edition places the photos (often more than one for a particular species, showing the plant in both flowering and fruit stages) directly with the text on each plant. This added convenience is immeasurable, as any field botanist or weekend hiker will attest. This edition covers more than 500 of the 800-plus plants that grow in the eastern U.S., and have been documented to provide some medicinal use. Measures 7-1/4" x 4-1/2" with 411 pages.