1. Arnold Arboretum of Harvard University, 22 Divinity Avenue, Cambridge, MA 02138, USA.
2. University of California Museum of Paleontology, 1101 Valley Life Sciences Building, University of California Berkeley, Berkeley, CA 94720–4780, USA.
3. National Herbarium of New South Wales, Royal Botanic Garden Sydney, Mrs Macquaries Road, Sydney NSW 2000, Australia.
4. Departamento de Ecologia, Universidade de São Paulo, São Paulo–SP, Brazil.
5. Department of Wildland Resources, 5230 Old Main Hill, Utah State University, Logan, UT 84322–5230, USA.
6. Cullman Program for Molecular Systematics, New York Botanical Garden, Bronx, NY 10458–5126, USA.