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