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Mainly on the larger land drains and the River Hull.
J F Robinson 1902: "Near Sutton Drain, Holderness."
Herbarium material: HLU : Hessle 1947 {A K Wilson}; Hessle 1951 {R Good}. HLL : Hessle 1932 {A K Wilson}. HUM : Dunswell Lane, Hull {J R Waller}.
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