Somewhat infrequent but occasionally in quantity. In rural areas usually associated with manure heaps.
J F Robinson 1902: "Cottingham and Hessle, Hull docks."
Herbarium material: HLU : Thwaite Hall, Cottingham 1929 {G A Glister}; King George Dock, Hull 1937 & 1939 {A K Wilson}; Hull 1953 {R Good}; Cottingham 1956 {R Good}.
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