This very interesting plant belongs to the buttercup family. The name palustris, is Latin for “of a marsh”, which is just where this plants likes to grow. Caltha palustris has many nicknames such as Kingcup in UK and cowslip in USA. It is also known as Calthus palustris syn. Trollius paluster Krause which is a member of the family Ranunculaceae. In the UK it is known by a variety of common names, depending on where you are at in the geographical region. Marsh Marigold, Kingcup, Mayflower, May Blobs, Mollyblobs, Pollyblobs, Horse Blob, Water Blobs, Water Bubbles, Gollins and the Publican. At Easter time the plant with the common name of marigold was used in Churches in medieval times as a tribute to the Virgin Mary, as in Mary gold.
It is very well known in the UK, and is one of the most ancient British native plants.