1. Department of Botany, National Museum of Natural History Smithsonian Institution Washington DC 20013‐7012 USA
2. Systematics and Evolution of Vascular Plants (UAB)—Associated Unit to CSIC, Departament de Biologia Animal, Biologia Vegetal i Ecologia, Facultat de Biociències Universitat Autònoma de Barcelona 08193 Bellaterra Spain
3. M.G. Kholodny Institute of Botany National Academy of Sciences Kiev 01601 Ukraine
4. Instituto Politécnico Nacional, CIIDIR Unidad‐Durango‐COFAA Durango C.P. 34220 Mexico
5. Laboratory of Molecular Systematics, Botanic Institute of Barcelona (IBB‐CSIC‐ICUB), Passeig del Migdia s.n. 08038 Barcelona Spain