kingcup or marsh marigold - caltha palustris flowers close up

angiosperm april beautiful bloom blooming blossom bog boggy botany buttercup caltha calthus colorful damp europe european flora floral flower forest gold green ground herbaceous kingcup kristiansand leaves marigold marsh may mayflower nature norway norwegian paluster palustris perennial petals plant ranunculaceae ranunculus semiaquatic spring summer swamp wet wild wildflower woods yellow