Wild plant. A single clump in a floodplain that is thoroughly infested with lesser celandine :-( I would say this goes into the A. maculatum bin because 1. dark spots on leaves, and 2. leaves are emerging in spring (it doesn't look like there are any over-wintered leaves, these leaves don't look full-sized). Some of the leaves have pale veins, perhaps that indicates some hybridization with A. italicum, I don't know. The landscape-level shot shows this clump (yellow arrow) in the larger context. This observation has also been reported in EDDMapS.