Since I have only a couple of cactus, which might be considered succulents and not cactus anyway, I decided to go to a cactus identification site to look at what was there. They have pictures of cactus very nicely arranged in alphabetical order. I am going to go through the alphabet to paint cactus. I just love cactus but the ones I am familiar with don't grow in our zone. So here goes... Acanthocalycium ferrarii.