Marsh Marigold (Caltha palustris) is also known as Caltha Cowslip, cowslip, cowflock, or kingcup. It is not really a marigold at all, rather a member of the Buttercup Family (Ranunculaceae). marsh marigold is a plant of wet places such as marshes, fens, ditches, wet woods, swamps. The flowers offer pollen and nectar to insects, and are most commonly pollinated by hoverflies (Syrphidae).
While parts of the plant are used medicinally, handling the plant can cause skin irritation, and uncooked parts are toxic to human consumption. Cattle and horses are also poisoned by consuming marsh marigold, although dried plants in hay are no longer toxic to them.


































