Swamp plant of Europe and North America having bright yellow flowers resembling buttercups; SYN. kingcup, meadow bright, May blob, cowslip, water dragon, Caltha palustris.
Plant Caltha palustris of the buttercup family Ranunculaceae, known as the kingcup in the UK and as the cowslip in the US. It grows in moist sheltered spots and has five-sepalled flowers of a brilliant yellow.