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Usually on drain banks.
J F Robinson 1902: "Frequent near drains, Hull and Cottingham."
Herbarium material: HLU : Cottingham 1929 {R Good}; Snuff Mill Lane, Cottingham 1938 {G A Glister}; Thwaite Hall, Cottingham 1954 {R Good}. HLL : Hessle 1932 {A K Wilson}.
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