An annual of waste ground and rubbish tips, which is introduced with grain, cork, wool and oil- and bird-seed. Lowland.
C. opulifolium was first recorded in the wild in Britain in 1853. It appears to be declining, perhaps as a result of improved seed cleaning techniques, but is much confused with variants of C. album and is possibly under-recorded.
A European Southern-temperate species, extending south to central Africa. It is difficult in many areas to distinguish native and alien occurrences.
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