Mammillaria saboae ssp. saboae
Mammillaria saboaeis a miniature cactus, and the flowers are larger than the cactus stems from which they grow. The flower on this cactus is about 1-1/2 inches wide, and the stem is only 1/2 inch wide. The spine configuration on the M. saboae is quite attractive, as shown in a previous post. There are 17 to 25 spines per aureole, and the arrangement looks like a tiny star burst.
In Phoenix, this Mammillaria species must be kept in light shade, and it must have a fast draining soil mix. It prefers drier soil, so care must be taken not to over water.