Spotting

You're right, that is confusing. Actually the notes I'm referring to here is just my inventory list (102 total!) of all my indoor plants. I got a cutting of this and the ID from a friend in the greenhouse at my work.

Thanks Dan. The cactus and Succulent Society has a confusing few paragraphs on how this was an opuntia, then wasn't, and now is again. http://www.cssainc.org/index.php?Itemid=...
You must have great notes!

Great news, I found this in my notes, so I won't have to check at work later. It has a few synonyms, and O. articulata is one of them. Sometimes it is O. articulata var. papyracantha.

I look forward to knowing the species. I feel a little bad disagreeing without having more positive information to share.
Whatever it is, I'm glad it's not in my garden! It looks lethal!

I know what you are saying Ava, it doesn't look like an Opuntia. It might possibly have been moved to another genus. Like I said, I will find it at work tomorrow, so we know for sure.

I don't think it's an opuntia since those are mostly pad cacti. Of course I have nothing useful as to what it might be.

I have this plant in my houseplant collection but I can't remember the species. I will check at the greenhouse at my work.