Fotografia in habitat da Chris Davies - Mexico trip 8
con questa nota:
At the border between Chihuahua and Sonoroa, on rocks on the northern side of the road, we found several Mammillarias, which looked rarther different from each other. I have asked the opinion of Wolfgang Plein who knows this area probably better than most, and it seems that what we saw were a number of Mammillaria maycobensis, exhibiting the variability of this species. Some botanists don't accept M. maycobensis as a valid species, lumping it into M. standleyi.
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