1. Department of Biodiversity and Plant Systematics; Centre for Organismal Studies (COS) Heidelberg; Heidelberg University; Im Neuenheimer Feld 345 69120 Heidelberg Germany
2. Missouri Botanical Garden; P.O. Box 299 St. Louis, Missouri 63166-0299 U.S.A.
3. Heidelberg Botanic Garden; Centre for Organismal Studies (COS) Heidelberg; Heidelberg University; 69120 Heidelberg Germany
4. Department of Biology/Chemistry; Botany Section, University of Osnabrück; Barbarastr. 11 49076 Osnabrück Germany