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Geranium phaeum carries seedheads high on the plant, G. macrorrhizum has seed heads low down in amongst the foliage or just above it.
Geranium phaeum has dark splodges on the leaves.
The leaves of G. macrorrhizum give off a very distinctive pungent smell when rubbed, crushed or even just brushed past.
Lat/Lng: 52.9887, -1.3132
OS grid ref: SK462437