       1982        
          l    Cenchrus pauciflorus Benth          Cenchrus echinatus L.       少花蒺藜草   蒺藜草 
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 http://www.cdfa.ca.gov/phpps/ipc/weedinfo/cenchrus.htm
 http://flowers.la.coocan.jp/Poaceae/Cenchrus%20echinatus.htm