Plants solitary, globose, gray-green, to 8 cm (3.1 in) high, to 12 cm (4.7 in) in diameter. Ribs 10-12, acute, straight. Central spine one, black, to 2 mm long. Radial spines 3-8, blackish. Flowers light pink, to 20 cm (7.9 in) long. Distribution: Paraguay. Echinopsis werdermannii is closely related to or the same as E. subdenudata.
Echinopsis yuquina d. r. Hunt 1991 Lobivia rauschiilechet 1974, not Echinopsis rauschil H. Friedrich 1974 (see E. obrepanda)
Plants commonly forming clumps, sometimes with 100 heads. Stems globose to short cylindrical, to 15 cm (5.9 in) high and 5 cm (2 in) in diameter. Ribs 13-16, forming distinct tubercles to 10 mm (0.4 in) high. Areoles round to oval, white. Spines needle-like, sharp, brownish. Central spines about 4, often forming a cross, to 3 cm (1.2 in) long. Radial spines 9-11, radiating, to 1 cm (0.4 in) long. Flowers red, to 4 cm (1.6 in) long and 3 cm (1.2 in) in diameter. Fruits oval, semidry, dehiscent. Distribution: Chuquisaca, Bolivia.
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