1. Departamento de Biología Área de Botánica Universidad Autónoma de Madrid Calle Darwin 2 Madrid ES–28049 Spain
2. The Field Museum 1400 S. Lake Shore Drive Chicago IL 60605‐2496 USA
3. Missouri Botanical Garden P.O. Box 299 St. Louis MO 63166‐0299 USA
4. Herbario Nacional de Bolivia Universidad Mayor de San Andrés Casilla 10077 Correo‐Central La Paz Bolivia
5. Department of Biology University of Missouri St. Louis MO 63121 USA
6. Laboratory of Plant Conservation and Population Biology Biology Department University of Leuven BE‐3001 Leuven Belgium