spurge
Concise Oxford English Dictionary © 2008 Oxford University Press:
spurge /spəːdʒ/
▶noun a plant or shrub with milky latex and small, typically greenish flowers. [Genus Euphorbia: numerous species.]
– origin ME: shortening of OFr. espurge, from espurgier, from L. expurgare ‘cleanse’ (because of the purgative properties of the milky latex).
'spurge' also found in these Oxford entries:

