Mammillaria & Coryphantha
Southeastern Arizona
Arizona Rare Cactus Photos

Mammillaria macdougalii  Flat Cactus  (formerly M. heyderi var. macdougalii)

Mammillaria grahamii  Pincushion
(formerly M. microcarpa)
M. grahamii typically has dark hooked spines.  Occasionally, specimens with
straight white spines are found.  These have been called M. oliviae, but notice
that the plant above has both types of spines.
Coryphantha vivipara  Beehive Cactus  (formerly C. vivipara var. bisbeeana)