Discocactus boomianus Buining & Brederoo 1971, D. zehntneri subsp.
boomianus (Buining & Brederoo) N. P. Taylor & Zappi 1991 Discocactus aibispinus Buining & Brederoo 1974, D. zehntneri subsp.
albispinus (Buining & Brederoo) P. J. Braun & Esteves 1995 Discocactus araneispinus Buining & Brederoo 1976, D. zehntneri subsp. araneispinus (Buining & Brederoo) P. J. Braun & Esteves 1995
Discocactus buenekeriW. R. Abraham 1987, D. zehntneri subsp.
buenekeri (W. R. Abraham) P. J. Braun & Esteves 1993 Discocactus zehntneri var. horstiorum P.J. Braun 1990, D. zehntneri subsp. horstiorum (P.J. Braun) P.J. Braun & Esteves 1995
Plants solitary, globose to flattened globose, dull green, to 7 cm (2.8 in) high and 10 cm (3.9 in) in diameter. Ribs 12-20, somewhat spiraled, forming nipple-like tubercles to 1 cm (0.4 in) high. Areoles sunken. Spines densely covering the plant, stout, white to yellowish, with dark tips, becoming pale brown to whitish, bent downward. Central spines absent. Radial spines about 11, pectinate, to 4.2 cm (1.7 in) long. Cephalia to 1 cm (0.4 in) high and 3.5 cm (1.4 in) in diameter, with cream to white wool and yellow to brownish bristles to 2 cm (0.8 in) long. Flowers slender funnelform, to 9 cm (3.5 in) long. Fruits club shaped, red, to 2.5 cm (1 in) long. Distribution: Bahia, Brazil.
All species of Discocactus are listed in Appendix I of cites. Two subspecies of D. zehntneri are recognized. Subspecies zehntneri tends to be globose and heavily covered by white, thin, needle-like spines. It has flowers to 3 cm (1.2 in) long, and small red fruits; it occurs near Sentoce. Subspecies boomianus tends to be more flattened globose and with yellowing spines with dark tips. It has larger flowers, to 9 cm (3.5 in) long, and it occurs in the Serra de Espinha^o.
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