Caltha palustris
Adult butterflies feed on nectar opportunistically, so the density of host plant "S. pratensis" does not affect adult butterfly feeding. In fact, by the time adult butterflies emerge, "S. pratensis" does not even flower. Adults are polyphagous and generally feed on "Ranunculus" ssp., "Cirsium" ssp., "Leucantherum vulgare", "Myosotis" ssp., "Rubus" ssp most often. They have also been observed feeding on "Caltha palustris", also known as kingcup or marsh-marigold, and "Ajuga reptans", also known as bugle or bugleweed.