A joint project by The Society for Preservation of Natural History Collections & The Royal Ontario Museum.

A treasury like no other Since the 1500s, scientists have documented the plants and fungi that grew around them, organizing the specimens into collections. Known as herbaria, these archives helped give rise to botany as its own scientific endeavor. Herbarium is a fascinating enquiry into this unique field of plant biology, exploring how herbaria emerged and have changed over time, who promoted and contributed to them, and why they remain such an important source of data for their new role: understanding how the world’s flora is changing. Barbara Thiers, director of the William and Lynda Steere Herbarium at the New York Botanical Garden, also explains how recent innovations that allow us to see things at both the molecular level and on a global scale can be applied to herbaria specimens, helping us address some of the most critical problems facing the world today. At its heart, Herbarium is a compelling reminder of one of humanity’s better impulses: to save things—not just for ourselves, but for generations to come.

"Contains chapters on the conservation of herbarium sheets and on the collection and curation of the larger algae. The chapter on computers has been completely rewritten and much enlarged, as have those on pests and treatments, larger fungi and economic botany. The sections on liquid preservatives and on pesticides have been revised to take into account new health and safety regulations. An essential reference work for herbarium managers and technicians and for all those who are involved with the making and maintenance of herbarium collections." --NHBS Environment Bookstore.

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 native or naturalized in the Commonwealth. It features a complete reorganization into a genetic scheme that reflects recent advances in our understanding of plant relationships.

The Baja California Plant Field Guide is a manual to native and naturalized plants of the Baja California peninsula, Mexico. It is a useful guide for the entire Sonoran Desert and for Southern California, as over 50% of the species covered also occur in these regions. Over 715 different plants in 111 plant families are identified (most in both English and Spanish), with both scientific and common names and detailed descriptions. Many species are illustrated with color photographs. Descriptions entail plant habit and height; stem, leaf, flower, and fruit morphology; range; elevation; pollination biology; ethnobotanical uses; and discriminating comparisons with close relatives. This book is intended for everyone from the interested novice to the professional botanist.