Mammillaria longimamma A P de Candolle 1828

FINGER CACTUS, NIPPLE CACTUS, PINEAPPLE CACTUS Dolichothele longimamma (A. P. de Candolle) Britton & Rose 1923 Mammillaria uberiformis Zuccarini ex Pfeiffer 1837, Dolichothele uberi-formis (Zuccarini ex Pfeiffer) Britton & Rose 1923, M. longimamma subsp. uberiformis (Zuccarini ex Pfeiffer) Krainz 1974

Plants usually solitary but later branching basally to form small clumps. Roots somewhat tuberous. Stems globose, glossy green, 8-15 cm (3.1-5.9 in) high and in diameter. Tubercles long, widely separated, flabby, cylindrical, elliptical in cross section, without latex, axils sparsely woolly. Central spine usually one, sometimes 2-3, sometimes absent, whitish with dark tips, to 25 mm (1 in) long. Radial spines 8-10, spreading, awl-like, straight or weakly curved, white to pale brown, 12-20 mm (0.5-0.8 in) long. Flowers funnelform, canary yellow, 40-60 mm (1.6-2.4 in) long and in diameter. Fruits globose to ovoid, yellowish, 10-12 mm (0.4-0.5 in) long. Seeds brown. Distribution: Hidalgo and Queretaro, Mexico.

Mammillaria longimamma, also illustrated on page 24; photograph by Bill Weightman
Mammillaria luethyi

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