Gaudinia fragilis

or alien. G. fragilis was cultivated in Britain by 1770 and was first recorded in the wild in 1903. It appears to have increased since 1980, though many new records are of well-established populations that must have been previously overlooked. It has a strikingly similar distribution to Oenanthe pimpinelloides and this, together with its preference for old meadows, has led some to consider that it might be native, at least in its core areas. Alternatively, it may have been introduced in the late 19th and early 20th centuries with grass seed imported from S. Europe.