Ball Cactus, Cream Cactus, Cream Pincushion, Flat Cream Pincushion, Heyder's Nipple Cactus

There a total of six subspecies:
The subspecies 'heyderi' has 1 central spine and 15-22 radial spines; Flowers are cream color wit...Read Moreh brownish-greenish midveins.
Subspecies 'gaumeri' has one central spine and 10-12 radial spines; Flowers are plain creamy-white.
Subspecies 'gumifera' has 1-2 central spines and 10-12 radial spines: Flowers are reddish-white with darker midviens.
Subspecies 'hemisphaerica' has 1 central spine and 9-13 radial spines; Flowers are Cream-colored to dusty pink.
Subspecies 'macdougalii 1-2 central spines which are stouter and 10-12 radials spines; Flowers are cream-colored to pale yellow.
Subspecies 'meiacantha' has one to none central spines and 5-9 radial spines; Flowers are pink or white with pink midviens.

Additional synonym:
Neomammillaria melanocentra var. meiacantha