Mammillaria guillauminiana Mammillaria guillauminiana Backeb. in Cactus (Paris) 33: 81. 1952 sec. Hunt 20161≡Mammillaria mercadensis var. guillauminiana (Backeb.) Repp., Gattung Mammillaria: 35. 1989 syn. sec. TROPICOS 1988+21. Hunt, D.R. 2016: CITES Cactaceae Checklist. 3rd edition. – published by the author, 2. TROPICOS 1988+: Tropicos.org. Missouri Botanical Garden – https://tropicos.orgContent