Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi ssp. geometricus
Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi
Tephrocactus alexanderi v. bruchii