The pics I've seen of this plant are always in the green range, until recently when I came across a green one and a brown one, they appear pretty much the same except for coloration. Is the brown a sub sp, variety, or form with a different or amended designation?
the typical green incarnation
brown one (gr one to the left).

I don't know these Euphorbias well, but could it be a red variety of Euphorbia trigona?

You might be on to something there. Euphorbia trigona f. rubra?

That's what I was wondering ... Euphorbia trigona red. I have that plant. It's 3-sided (trigonal) and the plant in the photo appears to have more than 3 sides to it. Or perhaps it's just the way I'm looking at the photo.

I agree, definitely appears to be two Euphorbia trigona: http://garden.org/plants/searc...

I added this photo of E. candelabrum to the database recently but the other pic's at this entry remind me of E. trigona:

Ah, yes, two plants growing together. That's why it looked a bit strange to me. It's Euphorbia trigona f. rubra. This did prompt me to take a more recent photo of mine to add to the database.

OK. Thanks all.

So are these E. candelabrum or E. trigona or...?
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I usually just go by the signs, justifying such action by deferring to said botanical source as a higher power; though they certainly can be wrong...

I have a question for someone who knows about euphorbia trigona... I recently got a 6ft+ indoor plant and it is in great condition other than a corky stem. The plant was starting to get too top heavy so I decided to head head it and replant the top. I am wondering if the corky rooted base is going to grow or if it will die... Does anyone have experience if a situation like this? See attached pics... thanks!

Keep it because you never know what will happen, but I'm guessing the older a stem is, the less likely it is to branch. If you want to make more plants, you can easily start one from a cutting taken closer to the top of the plant. Just be aware that the white sap which oozes under pressure can be a pretty bad irritant, so wear gloves and eye protection, and don't touch the fresh sap.