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Very common along the edge of the Humber and the River Hull. Occasionally straying a little further away.
J F Robinson 1902: "Common on the banks of the Hull and the Humber as far as the tide goes."
Herbarium material: HLU : Hessle foreshore 1930, 1954 {A K Wilson}. HLL : Hessle 1931 {A K Wilson}. BBC : Hull 1864. HUM : Stoneferry 1891 {J R Waller}; Albert Dock, Hull 1898 {H B W Smith}.
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