Abstract
Ripgut brome is found in high country Canterbury pastures but little is known of its prevalence and distribution In a 1020 km roadside vegetation survey all exotic and native plant species within a 5 m 5 m quadrat were identified at 10 km intervals Ripgut brome (Bromus diandrus) was present in 11 of the 165 quadrats which ranged from 40 to 950 m above sea level occurring most frequently below 200 m It was least often detected adjacent to intensive pastures (only 2 of quadrats) Agrostis capillaries (browntop) was present in 63 of quadrats followed by Trifolium repens (white clover 59) and Dactylis glomerata (cocksfoot 53) The lowest number of exotic species was detected adjacent to intensive pasture (58) and highest adjacent to forestry (86 species) Highest numbers of native species were present adjacent to semiimproved pastures (17) and above 500 m (23 species) Species prevalent on roadsides were commonly grazed in hill/high country pastures rather than being pasture weeds
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