Mammillaria flavicentra ML 194 Pala, above Coxcatlán, Puebla, Mexico 2250m
This species  (previously considered independent )  is now included in Mammillaria dixanthocentron.
 

Description: Plants solitary, densely covered by short golden spines encircled in white woolly rings.
Stem: Cylindrical or club shaped, up to 18 cm tall and 7-10 cm in diameter. Without latex.
Tubercles: Cylindrical. The axil has few wool at first, later with curly wool.
Central spines: 4 to 6 bright yellow (usually), orangish to dark brown, becoming brownish or whitish, approx 5-10 mm long.
Radials: 22-24 pale yellowish to almost pure white 2 - 4 mm long.
Flowers: Pale pink to red, small up to 5 mm in diameter
Fruits: Yellow below, orange above.
Seeds: Brown.

First description: Mammillaria flavicentra Backeb. ex Mottram 1980

Nowadays regarded as: Mammillaria dixanthocentron Backeberg
In: Descriptiones Cactacearum Novarum 3: 8, 1963

Accepted Scientific name: Mammillaria dixanthocentron var. flavicentra (Backeb. ex Mottram) Repp., 1987

Origin:  Mexico (Oaxaca, Puebla)

Habitat:  Mammillaria flavicentra is a facoltative saxicole that can be found either clinging in clefts and crevasses in the rock face and also on small hill, with oak trees, and on the shadier side, under the trees. Altitude 1200- 2700 m

Conservation status: Listed in CITES appendix 2.

Synonyms:  

• Mammillaria dixanthocentron subsp. flavicentra (Backeb. ex Mottram) U. Guzmán, comb et stat. Nov.

Cultivation: An easy-to-grow and easily flowering species, but not a fast grower.  Some plants will offset, and moderately large-sized clumps can be produced in a few years.
Water regularly in summer, but do not over-water (rot prone).  Use a pot with good drainage and a very porous potting media, and keep dry in winter.  Feed with a high potassium fertilizer in summer. Avoid frost.  Reputedly sensitive to low temperatures, but less so if kept on the dry side prior to, and during, cold weather. Outside full sun or afternoon shade, inside it needs bright light, and some direct sun. Bright light, encourages flowering and heavy wool and spine production.

Propagation: Direct sow after last frost, or division of larger plants.,