Mammillaria spinosissima subsp. pilcayensis (Bravo) D.R. Hunt Mammillaria spinosissima subsp. pilcayensis (Bravo) D.R. Hunt, Mammillaria Postscripts 6: 8. 1997 sec. Hunt 2016≡Mammillaria pilcayensis Bravo in Anales Inst. Biol. Univ. Nac. México 28: 37. 1958 syn. sec. Guzmán & al. 2003