My boyfriend selected these cacti from Lowes a few weeks ago and I'm wondering if any of you can identify them for me. I've been doing a lot of reading because I like to know what sorts of plants that I have, and I'm thinking that they're probably Mammillaria. I've found a couple different kinds that have reddish spines (M. rhodantha, M. spinosissima "rubrispina"), but I'm new to cacti and I'm not entirely sure how to tell them apart. As for the one with the short, yellow spines, I have no idea what kind it might be.

*The fake flowers on the one with the reddish spines have since been removed, so disregard those.

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