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Anyone called upon to identify fumitories should try to arm themselves with Rose Murphy's superb 'Fumitories of Britain and Ireland', BSBI Handbook No. 12.
Excellent photographic analyses of each species, including leaves and leaf segments, sepals, lower petals.
On second look, I think Alan is right, I wasn't sure.
Lat/Lng: 51.06865, -0.0899
OS grid ref: TQ339316