Robert L. Peters is a former Defenders of Wildlife conseruation biologist who holds a Ph.D. from Stanford, coedited Global Warming and Biological Diversity. Reed F. Noss , editor of Conservation Biology and science director of the Wildlands Project, was the coauthor of Saving Nature's Legacy, sponsored by Defenders of Wildlife. Some of the rarest plant communities in the conterminous United States grouped by major region of occurence and listing the states in which each community occurs.
Species can occur in more than one land type category.