Invasive alien woody plants of the southern and southwestern Cape region, South Africa

The frequency and abundance of invasive alien plants were recorded along roadsides and at watercourse crossings in 82.9% (145/175) of the quarter degree squares in the study area (31-35 degrees S, 17-25 degrees E and covering +/- 90000 km(2)). The survey yielded 102 species of which the most prominent (in order of prominence) in roadside and veld (natural and modified) habitats were: Acacia cyclops, A. saligna and A. mearnsii. The most prominent species (in order of prominence) in streambank habitats were: A. mearnsii, A. saligna and Populus x canescens.