Melocactus oreas Miquel 1840

Cactus oreas (Miquel) Britton & Rose 1922

Melocactus cremnophilus Buining & Brederoo 1972, M. oreas subsp.

cremnophilus (Buining & Brederoo) P. J. Braun 1988 Melocactus rubrisaetosus Buining, Brederoo &Theunissen 1977, M. oreas subsp. rubrisaetosus (Buining, Brederoo &Theunissen) P. J. Braun 1988

Plants depressed globose to elongate, medium to dark green, 8.5-35 cm (3.3-14 in) high, 10-18 cm (3.9-7.1 in) in diameter. Ribs 10-16, round in cross section but with acute edges. Spines yellowish brown to reddish brown, round in cross section. Central spines 1-4,27-45 mm (1.1-1.8 in) long. Radial spines 8-11, slender, flexible, straight or curved, 40-80 mm (1.6-3.1 in) long. Cephalia to 12 cm (4.7 in) high, 4-8 cm (1.6-3.1 in) in diameter, with dark reddish brown bristles. Flowers light to dark pinkish magenta, 17-22 mm (0.70.9 in) long, 7-10 mm (0.3-0.4 in) in diameter. Fruits elongate club shaped, red at the tip and magenta to pinkish below, 14-28 mm (0.6-1.1 in) long. Distribution: Bahia, Brazil.

Two subspecies of Melocactus oreas are recognized by the International Cactaceae Systematics Group. Subspecies oreas has stems that are globose to elongate and 10-15 cm (3.9-5.9 in) high, sometimes as high as 35 cm (14 in); it occurs at elevations below 500 m (1600 ft) in eastern Bahia. Subspecies cremnophilus has smaller stems that are often strongly depressed globose, usually less than 12 cm (4.7 in) high; it occurs above 700 m (2300 ft) in the more northern part of Bahia.

Melocactus pachyacanthus Buining & Brederoo 1975 Melocactus pachyacanthus subsp. viridis N. P. Taylor 1991

Plants depressed globose to elongate, green to gray-green, sometimes glaucous, 15-30 cm (5.9-12 in) high, to 20 cm (7.9 in) in diameter. Ribs 9-11, low. Spines all stout, reddish brown, overlaid by gray, some hooked in seedlings. Central spines 1-3, horizontally extended, 28-48 mm (1.1-1.9 in) long. Radial spines 8-9, straight or slightly curved, 25-49 mm (1-1.9 in) long. Cephalia to 12 cm (4.7 in) high and 10

Melocactus pachyacanthus subsp. j pachyacanthus cm (3.9 in) in diameter, nearly lacking wool but with dense dull pinkish red bristles. Flowers sometimes only partly expanded and barely exserted above the cephalia, pinkish magenta, 22-25 mm (0.9-1 in) long, 7-10 mm (0.3-0.4 in) in diameter. Fruits somewhat flattened, white or pale pink, 16-20 mm (0.6-0.8 in) long. Distribution: Bahia, Brazil.

Two subspecies of Melocactus pachyacanthus are recognized. Subspecies pachyacanthus has globose to elongate stems that are often strongly glaucous, especially when young; it occurs at elevations below 700 m (2300 ft) in northern Bahia. Subspecies viridis has depressed globose stems that are almost always not glaucous; it occurs above 700 m (2300 ft) in northern central Bahia.

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