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Usually only in the larger land drains, particularly the Holderness Drain where it is abundant. It also grows, as an introduction, in the wildlife pond in Pickering Park [TA 05 27].
J F Robinson 1902: "... Spring dyke, Hull where it still grows". Also mentions Dunswell and Sutton.
Herbarium material: HLL : Near Sutton 1933 {A E Wray}.
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