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Growing through hedges and in ditches, often in water. Also in gardens and waste ground.
Herbarium material: HLU : Hessle 1930 {A K Wilson}; Cottingham 1951 {R Good}; Cottingham 1952 {C Wilson}; Willerby 1955 {A K Wilson}; Wawne 1957 {R Good}. HLL : Springhead 1935 {A K Wilson}. HUM Beverley Road, Hull 1890 {J R Waller}.
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