1. Department of Conservation Ecology and Entomology and Centre for Invasion Biology; Stellenbosch University; Private Bag X1 Matieland 7602 South Africa
2. Conservation Science; Royal Botanic Gardens, Kew; Wakehurst Place Ardingly RH17 6TN United Kingdom
3. Biodiversity Management Branch; Department of Environmental Resource Management; City of Cape Town; South Africa
4. Centre for Invasion Biology; Department of Botany and Zoology; Stellenbosch University; South Africa
5. City of Cape Town; Private Bag X26 Tokai Cape Town South Africa