Affiliation: | Departamento de Ecología Evolutiva, Universidad Nacional Autónoma de México, Apartado 70–275, México DF 04510, México,;Smithsonian Tropical Research Institute, Apartado 2072, Balboa, Republic of Panama,;Department of Botany, University of Georgia, Athens, GA 30602, USA,;Department of Botany, The Field Museum, Chicago IL 60605, USA, and;Department of Plant Biology, University of Illinois, Champaign-Urbana, IL 61801, USA |