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Mammillaria difficilis Quehl
Monatsschr. Kakteenk. xviii. 107 (1908)

(7 Photos)
  • by cactus-art
  • by valentino
  • Juvenile specimen (La Paloma, Coahuila)
    by valentino
  • by valentino
  • El Pilar, Coahuila.
    by valentino
  • by amante
  • Coryphantha difficilis El Pilar
    by valentino