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Savannas and barrens were major components of the historic North American landscape before it was extensively altered by agricultural and urban development during the past century. Rock outcrop plant communities and serpentine barrens are of interest because they are refuges for endemic species adapted to extreme environmental conditions. Many of these communities are currently reduced to less than one percent of their original area and are imperiled ecosystems. This book provides a coherent and readable summary of the technical information available on savannas, barrens, and rock outcrop...