Hi Penny,

Rose Murphy says that there are about 60 species of fumitory worldwide and 10 in Britain. Of those only 2 are endemic and the remaining 8 are archeophytes (introduced before 1500 AD).

The ones that I've found in urban Manchester are Common Ramping Fumitory (Fumaria muralis) - this is by far the commonest and often occurs as a street weed, Common Fumitory (F. officinalis), White Ramping Fumitory (F. capreolata) and Tall Ramping Fumitory (F. bastardii). Other parts of the UK may well have a different mix of species.

Apparently Cornwall is the leading fumitory 'hot spot' - go to it Steve!