1. Slovak Academy of Sciences; Institute of Botany; Charles University in Prague; Department of Botany, Faculty of Science; Dúbravská cesta 9, Bratislava 845 23 Slovak Republic Benátská 2, Praha 2 128 01 Czech Republic
2. University of Vienna; Department of Systematic and Evolutionary Botany, Biodiversity Center; Rennweg 14, 1030 Vienna Austria
3. Institute of Botany; Academy of Sciences; Yerevan Armenia
4. Plazi; Zinggstrasse 16, 3007 Bern Switzerland
5. University of Southern Mississippi; Department of Biological Sciences; Hattiesburg, Mississippi 39406 U.S.A.
6. Universidad Complutense de Madrid; Departamento de Biología Vegetal II, Facultad de Farmacia; Madrid 28040 Spain
7. División Plantas Vasculares; Museo de la Plata, Paseo del Bosque s/n, La Plata 1900 Argentina
8. National Museum of Natural History, Smithsonian Institution; Department of Botany; Washington, D.C 20013 U.S.A
9. Royal Botanic Gardens; Herbarium; Kew, Richmond, Surrey U.K
10. V.L. Komarov Botanical Institute; Russian Academy of Sciences; Prof. Popov Street 2, St. Petersburg 197376 Russia
11. Freie Universität Berlin; Botanischer Garten und Botanisches Museum Berlin-Dahlem; Königin-Luise-Straße 6-8, Berlin 14195 Germany
12. University of Zurich; Institute of Systematic Botany; Zollikerstrasse 107, Zurich 8008 Switzerland
13. Universidade de São Paulo; Departamento de Botânica, Instituto de Biociencias; São Paulo, São Paulo 05508-090 Brazil
14. University of Regensburg; Institute of Botany; Universitätsstraße 31, Regensburg 93053 Germany
15. Institute for Biodiversity and Ecosystem Research of the Bulgarian Academy of Sciences and Pensoft Publishers; Geo Milev Str. No. 13a, 1111 Sofia Bulgaria
16. Universidade de Coimbra; Office of the Chief Director: Biosystematics Research and Biodiversity Collections, South African National Biodiversity Institute, Private Bag X101, Pretoria, 001 South Africa; Acocks Chair, Schweickerdt Herbarium, Department of Botany, University of Pretoria, Pretoria, 0002 South Africa; Centre for Functional Ecology, Departamento de Ciências de Vida; Coimbra 3001-455 Portugal
17. New York Botanical Garden; 2900 Southern Blvd., Bronx, New York 10458 U.S.A
18. New York Botanical Garden and JSTOR; 2900 Southern Blvd., Bronx, New York 10458 U.S.A.
19. Missouri Botanical Garden; P.O. Box 299, St. Louis, Missouri 63166 U.S.A
20. Institute of Botany, Chinese Academy of Sciences; Beijing 100093 China