In lieu of an abstract, here is a brief excerpt of the content:

Acknowledgments Funding to support costs of publication was received from: William L., III and Elizabeth P. McLean Sandra L. McLean John A. H. and Elizabeth J. Shober Mt. Cuba Center, Inc., Rick Lewandowski, Director University of Pennsylvania, Business Services Division We are also grateful to the following: The Wild Resource Conservation Program of the Pennsylvania Department of Conservation and Natural Resources, which funded our field work on aquatic plants through annual grants for the years 2000–2007; Pennsylvania Natural Heritage Program botanists Steve Grund and John Kunsman for access to their collection data; Bonnie Isaac, Herbarium of the Carnegie Museum of Natural History in Pittsburgh , James Bissell, Cleveland Museum of Natural History, Alina FreireFierro , Herbarium of the Academy of Natural Sciences of Philadelphia, and Daniel F. Brunton for access to specimen information from their collections; Barbara Lathrop, Pennsylvania Department of Environmental Protection Clean Lakes Program, who collaborated with us on vegetation and water sampling at many lakes; Chris Firestone, Bureau of Forestry, Pennsylvania Department of Natural Resources , who reviewed an early version of the manuscript and provided many helpful suggestions; the owners and managers of numerous lakes who provided access to us for the purpose of conducting surveys of aquatic plants; and, the John and Janet Haas Family, and the McLean Contributionship for their ongoing support of botanical research at the Morris Arboretum of the University of Pennsylvania. Block-Rhoads_FM_Final.indd 11 3/24/11 4:19 PM Block-Rhoads_FM_Final.indd 12 3/24/11 4:19 PM ...

Share