1. Department of Plant Science; University of Pretoria; Private Bag X20 Hatfield 0028 Pretoria South Africa
2. CapeNature; Assegaaibosch Nature Reserve; Private Bag X5014 Stellenbosch 7599 South Africa
3. Northern Cape Department of Environment and Nature Conservation; Goegap Nature Reserve; Private Bag X1 Springbok 8240 South Africa
4. South African Environmental Observation Network (SAEON): Arid Lands Node; P.O. Box 110040 Hadison Park 8306 Kimberley South Africa