Ladies and gentlemen, meet Euphorbia obesa:

She’s a fat little beauty, ain’t she?

One of my labmates just gave this to me as a gift (somebody else has the same obsessions!).  Euphorbia obesa is native to the great Karoo region of South Africa, where it is endangered.  They do so well in cultivation, though, that there are now more of them in pots than there are out in the wild.