Ten endangered species. An analysis of the geographic distribution of endangered species in the United States revealed that most are concentrated in a few regions of the country. However, the "hot spots" of potential extinction for different species groups rarely overlap. See page 550 and the Perspective on page 499. [Photos: Scrub mint (Dicerandra frutescens, low center), Thomas Eisner; others, U.S. Fish and Wildlife Service. Collage: Preston Morrighan]

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