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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 (3I-35°S, 17-25°E and covering ± 90 000 km:). 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 stream- bank habitats were: A. mearnsii, A. saligna and Populus x canescens.
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Lesley Henderson (1998) studied this question.
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