This introduced plant was first found in 1891 but has spread throughout the whole of England and Wales and much of southern Scotland too. There are raised lines on the stem and the plant is hairy with glandular hairs. It has a club shaped stigma and the leaves are usually opposite.

Apart from the far north of Scotland this introduction has naturalised itself throughout mainland Britain and fairly well in Ireland too.

Northwich, Cheshire 17th June 2005

Added on October 26th 2005, updated December 30th 2008, updated 29th March 2010, updated 21st July 2013