Maybe the last one is E. Milii... I'm not sure. The thorns and leaves just look different from my other E. Milii's a little. maybe just because its so small. Thoughts?

CactusNOOb
that so looks Like My Crown of thorns, of course if it were Bigger
I could Help you.
if it is Crown of Thorns, They get Huge

Elizabeth

Hi,

I doubt Euphorbia for the last one, looks more like an Alluadia, maybe procera. The leaf arrangement on the stems is so regular, like Alluadia; Euph leaves are not so strictly organized in a pattern like that.

Agree with PG. Definitely Allaudia. The last cactus pic is not Obregonia. Maybe a Thelocactus. Nice plants, can't have too many Stenocactus, and better yet, I liked them even better as Echinofossulocactus.

My guess is that the third one is Thelocactus rinconensis.

Plantlover,
I went back and forth a few times on it being CoT. But the leaves were really bugging me. I have a few CoT that are larger that I was trying to compare it against.

Pirate Girl,
I think your right on with Alluaudia procera. I google imaged it and there are definitely pics that look like it. Especially the leaves. Many thanks!!

Dzitmoidonc and Wantonamara,
Thelocactus could be right. I'm not positive on it being Rinconensis though. Probably need to let it grow some more and/or bloom to be sure.

Thanks everyone for the help !!

On the 3rd one, as with most cactus, can't say for sure the variability. To me, Thelocactus rinconensis v. hintonii or v. lophothele seem close. Hard to say if length of the central spine is variable. As you say, you may need to wait for it to grow & have a bloom to narrow down its ID.