fumitory
Concise Oxford English Dictionary © 2008 Oxford University Press:
fumitory /ˈfjuːmɪt(ə)ri/
▶noun a plant with spikes of small tubular pink or white flowers and finely divided greyish leaves. [Genus Fumaria.]
– origin ME: from OFr. fumeterre, from med. L. fumus terrae ‘smoke of the earth’ (because of its greyish leaves).
'fumitory' also found in these Oxford entries:

