I think this is Euphorbia lactea - can someone confirm that please and be more specific if poss. I bought it in agarden centre in France where it was sitting in a saucer full of water, I thought it needed saving and I've become really fond of it. I've seen the image of ? 'Silver Ghost' but it's not nearly so white
Euphorbia lactea variegata also called 'White Ghost' or 'Grey Ghost' is much more white than yours. Yours could be E. lactea (not variegated subspecies) http://davesgarden.com/guides/pf/go/91573/ .
You can also check other Euphorbia in PlantFiles: http://davesgarden.com/guides/pf/adv_search.php?Search=Click+here+to+search+for+plants
though Euphorbia is a very large genus. Some do look similar to E. lactea, for example E. trigona, E. ammak, and E. pseudocactus.
E. lactea it is then, thanks bagel_k
