Subfamily Cactoideae, tribe Cacteae.
Mammilloydia candida (Scheidweiler) Buxbaum 1951
SNOWBALL CACTUS, SNOWBALL PINCUSHION CACTUS Mammillaria candida Scheidweiler 1838, Chilita candida (Scheidweiler) Orcutt 1926 Mammillaria estanzuelensis H. Moeller ex A. Berger 1929, Chilita estanzuelensis(H. Moeller exA. Berger) Buxbaum 1954 Neomammillaria ortizrubiana Bravo 1931, Mammillaria ortizrubiana (Bravo) Werdermann ex Backeberg 1931, Mammilloydia ortizrubiana (Bravo) Buxbaum 1951, Mammilloydia candida subsp. ortizrubiana (Bravo) Krainz 1974
Plants solitary or clustering. Stems depressed globose to elongate, blue-green, to 30 cm (12 in) high, 6-14 cm (2.4-5.5 in) in diameter, covered by dense white spines. Tubercles broadly cylindrical, obtuse, not grooved, axils with four to seven white bristles. Spines numerous, in several series. Central spines 8-12, white with pinkish tips, to 10 mm (0.4 in) long. Radial spines as many as 120, white, spreading, to 15 mm (0.6 in) long. Flowers borne singly at the bases of the tubercles, rose pink or white with greenish red midveins, 2-3 cm (0.8-1.2 in) in diameter; pericarpels and floral tubes naked. Fruits ovoid, red to pink to whitish, juicy, indehiscent, 7-14 mm (0.3-0.6 in) long. Seeds black, with flat or domed testa, not pitted, 1 mm in diameter. Distribution: occurring widely in northeastern Mexico in Coahuila, Nuevo León, San Luis Potosí, and Tamaulipas.
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