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Would the size of the leaves and plant itself suggest Yellow Flag, rather than another variety of Iris?
Also is there anything in the fruit that could help to differentiate?
The shape, size and colour of the leaves would point to Iris pseudacorus rather than I. foetidissima.Also the fruits are less tapered than I. foetidissima, unless I'm mistaken!
David J Trevan
Lat/Lng: 52.5, -1.9
OS grid ref: SP1394