Cactus placentiformis Lehmann 1826 Discocactus insignis Pfeiffer 1837
Discocactus alteolens Lemaire ex A. Dietrich 1846, D. placentiformis subsp. alteolens (Lemaire ex A. Dietrich) P.J. Braun & Esteves 1995 Discocactus tricornis Monville ex Pfeiffer 1850 Discocactus latispinus Buining & Brederoo 1976 Discocactuspugionacanthus Buining & Brederoo 1976, D. placentiformis subsp. pugionacanthus (Buining & Brederoo) P. J. Braun & Esteves 1995
Discocactus pulvinicapitatus Buining & Brederoo 1976, D. latispinus subsp. pulvinicapitatus (Buining & Brederoo) P. J. Braun & Esteves 1993
Discocactus crystallophilus Diers & Esteves 1981 Discocactus multicoiorispinus Buining & P. J. Braun 1981 Discocactus pseudolatispinus Diers & Esteves 1987, D. latispinus subsp. pseudolatispinus (Diers & Esteves) P. J. Braun & Esteves 1993
Discocactus placentiformis subsp. multicoiorispinus (Buining & P. J. Braun) P. J. Braun & Esteves 1993
Plants solitary, flattened globose, dark green, 3-5.5 cm (1.22.2 in) high, 12-14 cm (4.7-5.5 in) in diameter. Ribs 12-15, more or less distinguishable into tubercles, to 1.5 cm (0.6 in) high with deep furrows between them. Spines black to reddish black, becoming gray with age, clawlike, bent downward, often grooved. Central spine 0-1, erect, 1.5-2 cm (0.60.8 in) long. Radial spines 3-5, lower one to 2.5 cm (1 in) long, lateral ones 1.3-2 cm (0.5-0.8 in) long. Cephalia 2.53.5 cm (1-1.4 in) high, 4-6 cm (1.6-2.4 in) in diameter, with gray or white wool and black bristles 1.5-2.5 cm (0.6-1 in) long. Flowers slender funnelform, to 7.5 cm (3 in) long. Fruits club shaped, white, to 3 cm (1.2 in) long and 0.8 cm (0.3 in) in diameter. Distribution: Minas Gerais, Brazil.
All species of Discocactus are listed in Appendix I of cites. None of the several subspecies of D. placentiformis described by Braun and Esteves (1993) has been accepted by the International Cactaceae Systematics Group.
Discocactuspseudoinsignis N. P. Taylor & Zappi 1991 Discocactus insignis in the sense of Buining 1986, not Pfeiffer 1837 (see D. placentiformis)
Plants solitary, flattened globose, light green, to 8 cm (3.1 in) high and 21 cm (8.3 in) in diameter. Ribs 12-13, straight, very acute, slightly raised between areoles, with poorly developed tubercles. Spines stout, sharp, dark reddish to black, becoming gray with age, mostly straight but some curved. Central spine one, usually erect, to 1 cm (0.4 in) long. Radial spines 5, one directed downward, others directed sideways, 2.5-3.2 cm (1-1.3 in) long. Cephalia globose, to 5 cm (2 in) high, 9-10 cm (3.5-3.9 in) in diameter, with white wool and dark brown bristles to 3.2 cm (1.3 in) long. Flow
ers tubular to funnelform, to 7.5 cm (3 in) long. Fruits club shaped, white to pinkish white, 32-45 mm (1.3-1.8 in) long, 5-9 mm (0.2-0.4 in) in diameter. Distribution: Minas Gerais, Brazil. All species of Discocactus are listed in Appendix I of cites.
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