Coryphantha tripugionacantha a b Lau 1988

Plants usually solitary, globose, slightly depressed apically, blue-green when young, later dull green, 7-9 cm (2.8-3.5 in) high, 8-9 cm (3.1-3.5 in) in diameter. Tubercles flattened, more or less rounded, to 20 mm (0.8 in) high, axils woolly at first, later naked, without glands. Central spines 3, very stout, curved inward, gray with dark tips, radiating, 18-20 mm (0.7-0.8 in) long, lower one longest. Radial spines 8-9, radiating, curved inward, unequal, brownish gray, 8-10 mm (0.3-0.4 in) long. Flowers creamy yellow, 6-7 cm (2.4-2.8 in) in diameter. Fruits oblong, juicy, opaque green, to 35 mm (1.4 in) long. Distribution: Zacatecas, Mexico.

Continue reading here: Coryphantha unicornis Boedeker 1928

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