Description: Mammillaria spinosissima is a
columnar plant, usually solitary, but it can form pups on old plants. M.
spinosissima is very variable because of its wide area of origin in
Mexico. The color of the spines varies from red or rust to white.
Stem: Cylindrical, dark blue-green, rarely exceeding 30 cm in
height, 6 - 7 (10 cm) cm in diameter. Without latex.
Parastichy: 13 - 21.
Tubercle: Ovate, conical, four-sided basally.
The axil is slightly woolly.
Radial spines: 20 - 25, white, bristle-like, 4 - 6 mm long.
Central spines: 12 - 15, copper-red, stronger than the radials and
thicker at the base, straight, 10 - 12 mm long.
Flowers: Vivid purple/ red to deep pink, 12 mm long and in
diameter encircling the columnar stems.
Blooming season: Late winter and spring,
Fruits: Purplish red or greenish.