Chelostoma rapunculi is a species of solitary bee commonly known as the rapunzel cuckoo bee. It is found in Europe and parts of Asia. This bee species is known for its striking metallic green coloration and its habit of parasitizing the nests of other bees, particularly those of the genus Chelostoma. It plays an important role in pollination and is often found in meadows and gardens where its preferred host plants, such as bellflowers, are abundant.