I'm trying so hard to learn to ID my own cactuses but there are so many variables to consider, so I still need help. Anyone know of a good website or favorite cactus book to learn from? I'm going to try to attend the next cactus and succulent club meeting in my town, but that won't be for a while. In the meantime, I have two cactus that need IDs. I'm hoping someone can help me out. I think they're both relatively common, but they're new to me. They were procured from a very nice cactus-only store today. And, yes, I know the mix they're in is just awful. I've already repotted them in gritty mix. I tried to do a close-up of the yellow one's flower. The other one's bloom is pink and white but closed up when the owner removed it from its community pot to its transport pot. I'll try to get a picture of it tomorrow when it opens back up.