1. Department of Organismic and Evolutionary Biology, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts 02138 USA
2. Rua Dr. Mário de Nucci, 500, Cidade Universitária 13083‐290, Campinas, Brazil
3. Departamento de Botânica, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, Rio de Janeiro 20940‐040, Brazil
4. Ecoinformatics and Biodiversity, Department of Biological Sciences, Aarhus University, Ole Worms Allé, Building 1137, 8000 Århus C, Denmark
5. Western Connecticut State University, Biological & Environmental Sciences, 181 White Street, Danbury, Connecticut 06810 USA
6. University of Zurich, Institute of Systematic Botany, Zollikerstrasse 107, CH‐8008 Zurich, Switzerland