The second edition of The Plants of Pennsylvania is the authoritative guide to identifying the nearly 3,400 species of flowering plants, ferns, and gymnosperms

Ralph Waldo Emerson defined a weed as a plant whose virtues have not yet been discovered. To the wild-plant enthusiast who has discovered the virtues of many pl

The definitive guide to Pennsylvania's plant life.

Grasses are among the most ubiquitous plants on the planet. They inhabit a wide geographic range and are found in a variety of natural habitats. The small parts

Authoritative, encyclopedic, lavishly illustrated guide to the trees of the state and region—from the Morris Arboretum, the official arboretum of the Commonwe