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Only found in the ditches of Priory Road meadows.
J F Robinson 1902: "Not infrequent near Hull, as at Spring Head and Dunswell Lane, near Cottingham."
Herbarium material: HLU : Cottingham 1929 {R Good}; Cottingham 1952 {D A Wilkins}; Cottingham Road, Hull 1952 {D A Wilkins}; Thwaite Hall 1953 {C Wilson}.
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