This European introduction is heavily concentrated around the London area where it is a common roadside plant. It occurs in swathes at the side of motorways leading into London but the distribution drops off as you go north. There is little to be found in Scotland, none in Ireland and only a little in Wales.

Snake Pass, A57 Pennines 13th July 2008

Added on 9th August 2006, updated 18th January 2009, updated 31st March 2010, updated 5th Feb 2015