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Xanthium strumarium
 
   
 
Common name: There are at least 4 of the species in Australia.  Common names are Cockle burr and Noogoora burr.
 
This plant is a robust branched, woody annual herb growing to 2m tall.  Its fruit is a hard woody burr with a hooked spine and 2 taller straight spines at the end. It's leaves are maple leaf-shaped and will often appear during a wet season.  
 
Distribution:
 
 
Much of NSW, Qld, central northern Vic, SA, WA, NT.  Darling and Western Downs, Burnett region, Central Qld, northern NSW, Moreton region and north Qld.
 
Bibliography: 
 
Amor, R.L., Barnett, A. G. and Wilding, J. L. (1986) Crop Weeds, Inkata Press, Melbourne.
Auld, B.A. and Medd, R.W. (1987) Weeds: an illustrated botanical guide to the weeds of Australia, Inkata Press, Melbourne.