Plants solitary or with only a few branches. Taproots greatly swollen. Stems ovoid to cylindrical, tapered toward the tips, annually constricted, dark green, 3-8 cm (1.2-3.1 in) long, 2-3 cm (0.8-1.2 in) in diameter, not obscured by spines. Ribs 6-10, low, barely tuberculate. Central spines 1-2, slender, ascending, brown to black, 1-2 cm (0.4-0.8 in) long. Radial spines 9-15, flattened against the surface, whitish with dark tips, 0.4 cm long. Flowers borne near the stem tip but not bursting through the epidermis, funnelform, fragrant, pinkish lavender to purple, to 5.5 cm (2.2 in) long and 5 cm (2 in) in diameter. Fruits ovoid, green with white pulp. Distribution: Chihuahua, Mexico.
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