![](http://www.alamy.com/thumbs/6/C8563B71-4596-41A4-B4C2-67AD254DA1B6/2FK8156.jpg)
St. Barnaby's thistle (Centaurea solstitialis) is a noxious weed in New South Wales and a summer annual plant that can outcompete crops and pastures
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Photo credit: © Stephen Dwyer / Alamy / Afripics
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Keywords: australia, australian, barnabys, centaurea, centaury, cockspur, declared, environmental, golden, invasive, knapweed, noxious, pasture, regional, south, spiny, st., star, starthistle, thistle, wales, weed, weeds, yellow