1. Ghent University; Department of Biology; Research Group Spermatophytes; K.L. Ledeganckstraat 35 9000 Gent Belgium
2. University of Cape Town; Botany Department; Pearson building; University Avenue; Private Bag 7707 Rondebosch South Africa
3. Royal Botanic Gardens; Kew Richmond, Surrey TW9 3AB U.K.