Mammillaria pennispinosa Krainz subsp. pennispinosa in Sukkulentenkunde 2: 20. 1948 sec. Hunt 2016
- =Phellosperma pennispinosa (Krainz) Buxb. in Oesterr. Bot. Z. 98: 92. 1951 syn. sec. Guzmán & al. 2003
- =Escobariopsis pennispinosa (Krainz) Doweld in Sukkulenty 3: 41. 2000 syn. sec. Guzmán & al. 2003