Anagallis tenella known in Britain as the bog pimpernel, is a low growing, perennial plant found in a variety of damp habitats from calcareous dune slacks to boggy and peaty heaths in Eurasia but absent from North America. In the UK it is mostly restricted to the western half of the country although it was more common in the east prior to land drainage and intensification of farming in the east of the country. In England this plant is a component of the Purple moor grass and rush pastures BAP habitat.