identification Mammillarias

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# 3 could be mammillaria evermanniana

# 1 mammillaria hahniana ssp mendeliana

mammillaria hahniana ssp mendeliana ML 234
ML 234 - rio blanco, 1680m - guanajuato/queretaro - mexico
from "UK mammillaria reference collection"

Nos 2 & 4 are quite similar, but I think I'd put No 2 as a form of M. tlalocii, with rather shorter single central spine than usual. I'd put No 4 as either a very short spined form of M. albilanata ssp oaxacana or M. supertexta, with very short central spines. I can't see clearly enough how many centrals, if any, the plant has.

I agree with Maurillio on #3 as M. evermanniana, but not sure on No 1. It could be as Maurillio says, but its spines are very much stronger and some curved as well. I'll give it some more thought and look deeper into my books.