Mammillaria pilispina J a Purpus 1912

Neolloydia pilispina (J. A. Purpus) Britton & Rose 1923, Chilita pilispina

(J. A. Purpus) Buxbaum 1954 Mammillaria sanluisensis Shurly 1949, Chilita sanluisensis (Shurly)

Buxbaum 1954 Mammillaria subtilis Backeberg 1950 Mammillaria rayonensis Reppenhagen 1991

Plants forming clumps. Stems semiglobose, to 4 cm (1.6 in) in diameter. Tubercles cylindrical, without latex, axils with wool and a few hairlike bristles. Central spines 7, erect, straight, with 6 subradial spines at the top and on the sides of

Mammillaria petterssonii

the areoles, white, yellow basally, with dark tips, pubescent, 6-7 mm (0.2-0.3 in) long. Radial spines several, very fine, pubescent, hairlike, white, in a ring behind the other spines. Flowers creamy white, sometimes with pinkish midveins, 15-20 mm (0.6-0.8 in) long and in diameter. Fruits reddish orange. Seeds black. Distribution: Coahuila, Nuevo León, Tamaulipas, and San Luis Potosí, Mexico.

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