Possibly under recorded, usually on walls or similar. Distribution does, however, correspond well with that noted by Fraser!
J F Robinson 1902: "Waste places, banks of the River Hull, near Stoneferry, June 1898; Near Wawne (C Waterfall).
Herbarium material: HLU : Cottingham 1955 {A K Wilson}; East Park, Hull 1957 {A K Wilson}.
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