Marsh marigold is a flowering plant that belongs to the buttercup family. It is also known as kingcup, COWSLIP, and cowlily. Kingcup is a seven-letter term for marsh marigold, while COWSLIP and cowlily are both seven-letter terms for the same plant. Marsh marigold is native to Europe, Asia, and North America and is often found in wet meadows and marshes. It is a perennial plant with bright yellow flowers and glossy green leaves.