http://public.fotki.com/Ondy/my_collect ... _id/mamms/
I believe the first one is a M. magnimamma.
The second I think is a M. karwinskiana ssp nejapensis but I'm not as sure of that as the third one which I'm pretty sure is M. karwinskiana ssp nejapensis.
The last two present a problem. I feel like the second to last is a M. spinosissima ssp. spinosissima which I had an earlier post of a similar cactus that most of you were in fact naming it a spinosissima, but now I'm not so sure. Here is a link to that one.
http://public.fotki.com/Ondy/my_collect ... known.html
You see there is a M. rhodantha ssp rhodantha that matches the last pic and my previous posting much closer in my opinion. I haven't seen the flowers on these but both species have very similar flowers. I just feel that the spines one the spinosissima are smaller, more dense, and not curved at all. This all just gives me a headache. Please help.
Andy