Author Affiliations +
Stanwyn G. Shetler,1 Sylvia S. Orli,1 Elizabeth F. Wells,2 Marcie Beyersdorfer3
1Department of Botany, MRC 166, National Museum of Natural History, P.O. Box 37012, Washington, D.C. 20013-7012, U.S.A. e-mail: ; shetlers@si.edu stones@si.edu
2Department of Biological Sciences, George Washington University, Washington, D.C. 20052, U.S.A. e-mail: efwells@gwu.edu
3HC 32 P.O. Box 432, Petersburg, WV 26847, U.S.A. e-mail: jshaw@access.mountain.net