1. Botanical Institute; University of Cologne; D-50674; Cologne; Germany
2. Alexander Holm & Associates; PO Box 1835; Fremantle; WA; 6959; Australia
3. Faculty of Geography; University of Marburg; D-35037; Marburg; Germany
4. Biology Department; University of New Mexico; Albuquerque; NM; 87131; USA
5. Department of Animal, Wildlife & Grassland Sciences; University of the Free State; PO Box 339; Bloemfontein; 9300; South Africa
6. Department of Botany; Senckenberg Museum for Natural History; PO Box 300 154; D-02806; Görlitz; Germany