Mammillaria ocotillensis Mammillaria saint-pieana Mammillaria macdowellii Mammillaria armatissima Mammillaria hastifera Mammillaria guanajuatensis Neomammillaria hamiltonhoytiae Neomammillaria gigantea Mammillaria flavovirens f. cristata Mammillaria gigantea subsp. hamiltonhoytiae Mammillaria hamiltonhoytea Mammillaria hamiltonhoytiae var. fulvaflora Mammillaria ocotillensis var. brevispina Mammillaria ocotillensis var. longispina Neomammillaria hamiltonhoytea Mammillaria hamiltonhoytiae Mammillaria flavovirens var. cristata Mammillaria gigantea subsp. flavovirens
World Flora Online, http://www.worldfloraonline.org/, accessed June 20, 2024