I don't know the species. I think it's one of the hedgehogs, and still pretty young. I do not remember either flowers or fruit on it, I don't know how tall/big it will get. I don't know anything about it. I think I got it in one of those tiny 2" pots someplace. If it is a hedgehog, it's in the echinocereus genera.
It's not a saguaro-- that 's a baby saguaro under the yellow hose attachment behind the model-- prickly-pear, or cholla! (The hose attachment is providing protection/shade for the baby from the hot sun. That shades it before noon, the wall after noon.