Melocactus mazelianus Riha 1981

Plants depressed globose to pyramidal or ovoid, yellowish green to dark green, 9-27 cm (3.5-11 in) high, 7-20 cm (2.8-7.9 in) in diameter. Ribs 9-15, acute between the areoles. Spines black at first, later reddish brown to dark brown, sometimes overlaid with gray. Central spines 0-3, straight or slightly curved upward, 15-45 mm (0.6-1.8 in) long. Radial spines 6-11, straight or curved, 16-40 mm (0.6-1.6 in) long, lower ones longest. Cephalia to 12 cm (4.7 in) high and 8 cm (3.1 in) in diameter, with bristles usually hidden in conspicuous white wool. Flowers deep crimson, to 26 mm (1 in) long, 10-14 mm (0.4-0.6 in) in diameter, pink. Fruits to 41 mm (1.6 in) long. Distribution: eastern Colombia and western to central Venezuela.

Melocactus neryi K. Schumann 1901 Cactus neryi (K. Schumann) Britton & Rose 1922 Melocactus guaricensis Croizat 1950 Melocactus schulzianus Buining & Brederoo 1974

Plants depressed globose, dark blue-green to yellowish green, 5.5-18 cm (2.2-7.1 in) high, 7-20 cm (2.8-7.9 in) in diameter. Ribs 9-15, sharply acute. Areoles sunken into notches in the ribs. Spines dark brown to yellowish brown or reddish brown with age, thickly overlaid with whitish gray. Central spine usually one, curved upward, 10—25 mm (0.4-1 in) long. Radial spines 6-10, curved, to 29 mm (1.1 in) long. Cephalia usually quite broad, to 5 cm (2 in) high, 4-9 cm (1.6-3.5 in) in diameter, with fine, dense, reddish to orangish red bristles. Flowers sometimes barely exserted above the cephalia, pink to purplish crimson, 18-22 mm (0.7-0.9 in) long, 8-10 mm (0.3-0.4 in) in diameter. Fruits pink to lilac-pink, 10-20 mm (0.4-0.8 in) long, sometimes flattened. Distribution: western and central Venezuela, northern Brazil, and Suriname.

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