[sroberts]

Hi, Tobias

Well that certainly gave me something to think about. They are all similar in their spiral growth and spination but I think the the two you listed have branches that are more ribbed while what I have is more cylindrical.

The E. tortirama has spines that are up to 20mm (3/4") long. The spines on mine are only 3-6mm (1/8-1-4") long, mostly on the shorter side.
E. tortirama also grows in segments while groenewaldii is not constricted to segments. This according to The Euphorbia Journal volume 2.

I think for now I will stick with groenewaldii as the name but yes, as you say, there are many that can be very close in this genus!

That is a nice website link you gave, thanks.

Steve