Mammillaria lloydii (Britton & Rose) Orcutt Mammillaria lloydii (Britton & Rose) Orcutt, Cactography 7. 1926 sec. Guzmán & al. 2003≡Neomammillaria lloydii Britton & Rose, Cactaceae (Britton & Rose) 4: 89. 1923 syn. sec. Guzmán & al. 2003