1. Department of Botany, National Museum of Natural History; Smithsonian Institution; Washington DC 20013-7012 USA
2. Missouri Botanical Garden; P.O. Box 299 St. Louis MO 63166-0299 USA
3. The Academy of Natural Sciences of Drexel University; 1900 Benjamin Franklin Parkway Philadelphia PA 19103 USA
4. Department of Ecology, Evolution, and Organismal Biology; Iowa State University; Ames IA 50011 USA
5. Real Jardín Botánico; Consejo Superior de Investigaciones Científicas; Plaza de Murillo, 2 Madrid, 28014 Spain
6. Botany Section, Research and Collections; Canadian Museum of Nature; Ottawa ON K1P 6P4 Canada
7. Instituto de Botánica Darwinion; Labardén 200; San Isidro B1642HYD Buenos Aires Argentina