1. Department of Botany, P.O. Box 77000, Nelson Mandela University, Port Elizabeth, 6031 South Africa.
2. Centre for Functional Ecology, Departamento de Ciências da Vida, Universidade de Coimbra, 3001-455 Coimbra, Portugal.
3. Biosystematics Research and Biodiversity Collections Division, South African National Biodiversity Institute, Private Bag X101, Pretoria, 0001 South Africa.
4. H.G.W.J. Schweickerdt Herbarium, Department of Plant Science, University of Pretoria, Pretoria, 0002 South Africa.
5. Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166-0299, U.S.A.
6. Biodiversity Research, Assessment and Monitoring, South African National Biodiversity Institute, P.O. Box 52099, Berea Road, 4007 South Africa.
7. School of Chemistry and Physics, University of KwaZulu-Natal, Durban, 4041 South Africa.