Similar to the more common “Bishop’s Cap” but not the same. After all, they are different species.
Astrophytum ornatum. Or Astro, as I call it.
Usually they’re dark green. And they like shade in the hotter climates. But we can grow them in full sun, carefully, and they’ll turn red. Slow growing, but they can get tall – over 3 ft. tall if you’re lucky!
The book says their aureoles “often become glabrous.” I wonder what that means?