1. Centre for Invasion Biology, Department of Botany and Zoology; Stellenbosch University; Matieland 7602 South Africa
2. Invasive Species Programme, South African National Biodiversity Institute, Kirstenbosch Research Centre; Cape Town South Africa
3. SEEC - Statistics in Ecology, Environment and Conservation, Department of Statistical Sciences, University of Cape Town; Rondebosch 7701 South Africa
4. African Climate and Development Initiative; University of Cape Town; Cape Town, Rondebosch, 7701 South Africa
5. National Herbarium, Pretoria; South African National Biodiversity Institute; Pretoria South Africa
6. Department of Biodiversity and Conservation Biology; University of the Western Cape; Private Bag X17 Bellville 7535 Cape Town South Africa
7. CSIRO Tropical Ecosystems Research Centre; PMB 44 Winnellie NT 0822 Australia