1. Office of the Chief Director: Biosystematics Research & Biodiversity Collections; South African National Biodiversity Institute; Private Bag X101 Pretoria 0001 South Africa
2. Acocks Chair, H.G.W.J. Schweickerdt Herbarium, Department of Plant Science; University of Pretoria; Pretoria 0002 South Africa
3. H.G.W.J. Schweickerdt Herbarium; Department of Plant Science; University of Pretoria; Pretoria 0002 South Africa
4. Brooklyn Botanic Garden; 1000 Washington Avenue Brooklyn, New York 11225 U.S.A.