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all parts of the flower are poisonous.
Wild Flower Society member
Sorry - greater celendine, not Meconopsis - seed capsule wrong.
It has a bright yellow sap that is unmistakable. This was used as a treatment for warts, but as pointed out above, it's poisonous, so must be used externally only, and with care.
Lat/Lng: 52.4, -1.9
OS grid ref: SP1188