An annual occurring as a casual in arable fields, rubbish tips and waste ground. It is probably introduced with grain. Lowland.
C. microcarpa was recorded from the wild in Britain in 1870 (Fife). Formerly widespread, it has declined and is now extremely rare. This decline may be due to improved seed-cleaning techniques.
Native of C. & S. Europe, N. Africa and S.W. & C. Asia; naturalised in N. America.
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Atlas text references
Jalas & Suominen (1996)
1965. Vergleichende Chorologie der zentraleuropäischen Flora. Volume 1. 2 vols.
1991. Crucifers of Great Britain and Ireland. Botanical Society of the British Isles Handbook no. 6.