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Received April 2, 2001; Accepted October 22, 2001.

ANGELLA MOOREHOUSE,1 ANNE MANKOWSKI,2 WILLIAM E. McCLAIN,2 and JOHN E. EBINGER3

1Illinois Nature Preserves Commission, 524 South Second Street, Springfield, Illinois 62701;

2Illinois Department of Natural Resources, 524 South Second Street, Springfield, Illinois 62701;

3Emeritus Professor of Botany, Eastern Illinois University, Charleston, Illinois 61920