1. South African National Biodiversity Institute, KZN Herbarium, Durban, South Africa
2. School of Agricultural, Earth and Environmental Sciences, Discipline of Geography, University of KwaZulu-Natal, Durban, South Africa
3. South African National Biodiversity Institute, Kirstenbosch Research Centre, Cape Town, South Africa
4. Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa
5. Department of Invasion Ecology, Institute of Botany, The Czech Academy of Sciences, Průhonice, Czech Republic