Little Nipple Cactus (Mammillaria heyderi) also commonly known as Heyder's Pincushion Cactus, is a species of plant in the class Magnoliopsida in the family Cactaceae (Cacti) and order Caryophyllales.
Mammillaria grahamii
Mammillaria viridiflora
Mammillaria heyderi
Mammillaria pottsii
Mammillaria thornberi
Mammillaria wrightii