Species Notes: This species is a low-growing, seldom-clumping Mammillaria with large yellow flowers. There is no clear distinction between central and radial spines. Between 4 and 8 spines are present on prominent, 4 angled tubercles. The axils are wooly, but become naked over time. Stem diameter is less than 4 inches (10cm) and it has a bluish color.
Cultivation Notes: This species does best with some shade.
Original Description:The Cactaceae 4
p.85 - Britton & Rose (1920)
Plants solitary or in clusters, deeply seated in the ground, more or less flat-topped, bluish green, the stems and tubercles very milky; tubercles erect, pointed, 4-angled, pale green; radial spines 4 to 8, nearly erect, short and pale with brown tips, one sometimes nearly central; axils of tubercles bearing long wool but in age naked; flowers 1.5 cm long, arising from old tubercles but near the center; outer perianth-segments narrow, reddish; inner perianth-segments narrow, acuminate, green or light yellow with erose margins; stamens pale; style longer than stamens; stigma-lobes green, linear.
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