1. Royal Botanic Gardens; Kew; Richmond Surrey TW9 3DS UK
2. School of Plant Biology; The University of Western Australia; Crawley WA 6009 Australia
3. Birge Hall, 430 Lincoln Drive; University of Wisconsin; Madison WI 53706-1381 USA
4. Ohio State University Herbarium; Department of Evolution, Ecology and Organismal Biology; 1315 Kinnear Road Columbus OH 43212-1157 USA
5. Departamento de Botánica, Instituto de Biología; Universidad Nacional Autónoma de México; Apartado Postal 70-367 04510 Mexico City Distrito Federal Mexico
6. Univsidade Estadual de Feira de Santana; Ciências Biológicas, Av. Transnordestina, s/n 44036-900 Feira de Santana-BA Brazil