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Still to be found on the banks of the River Hull and some of the land drains. It seems to be decreasing.
J F Robinson 1902: "Very frequent". Particular mention of Cottingham and Marfleet.
Herbarium material: HLU : Cottingham 1949 {R Good}; Snuff Mill Lane, Cottingham 1953 {Wilson}. HLL : Hull 1932 {A K WIlson}. HUM : Beverley Road, Hull 1890 {J R Waller}.
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