Plants usually solitary, globose, somewhat depressed apically, gray-green, 3-4 cm (1.2-1.6 in) high, 6-9 cm (2.4-3.5 in) in diameter. Ribs 10-12, acute, forming hatchet-shaped tubercles. Areoles elliptical, gray, to 1.5 cm (0.6 in) apart. Spines gray with brown tips. Central spine one, directed upward, curved inward, awl shaped, 1.5-2 cm (0.6-0.8 in) long. Radial spines 7-9, curing, pectinate and flattened against the stem surface, 0.8—1.5 cm (0.3-0.6 in) long. Flowers borne laterally, open at night, light magenta to nearly white, to 15 cm (5.9 in) long. Distribution: Oropeza province, Chuqui-saca, Bolivia.
Echinopsis callichroma Cárdenas 1965 Pseudolobivia callichroma (Cárdenas) Backeberg 1966
Plants usually solitary, globose to somewhat conical, gray-green, 2-3 cm (0.8-1.2 in) high, 12-15 cm (4.7-5.9 in) in diameter. Ribs 17-19, acute, notched, forming tubercles to 1 cm (0.4 in) high. Areoles elliptical, gray, 1-2.5 cm (0.4-1 in) apart. Spines 12-14, pectinate, flexible, curved, gray, needlelike, 2-6 cm (0.8—2.4 in) long. Flowers long funnelform, bright reddish magenta to fuchsia, with dark midveins, 8-9 cm (3.1-3.5 in) long. Distribution: Tapacari province, Co-chabamba, Bolivia.
Echinopsis calochlora K. Schumann 1903 ?Echinopsis grandiflora Linke 1857
Echinopsis calochlora subsp.glaetzleana P. J. Braun & Esteves 1994
Plants solitary or clustering. Stems globose, deep green, 6-9 cm (2.4-3.5 in) in diameter. Ribs 13-16, broad, notched. Areoles sunken in the ribs, to 1.5 cm (0.6 in) apart. Spines yellow, needle-like. Central spines 3-4, slightly longer than the radials and with dark tips. Radial spines 14-20, ascending, to 1 cm (0.4 in) long. Flowers borne laterally, white, to 16 cm (6.3 in) long. Distribution: Brazil.
Two subspecies of Echinopsis calochlora are recognized. Subspecies glaetzleana differs from subspecies calochlora in having stems to only 7.5 cm (3 in) in diameter, 14-16 ribs rather than 13, and smaller flowers. It is found in Mato Grosso do Sul rather than Goiás.
Echinopsis camarguensis (Cárdenas) H. Friedrich &
G.D.Rowley 1974 Trichocereus camarguensis Cárdenas 1953
Plants shrubby, columnar, often with several curving, ascending branches, to 50 cm (20 in) high. Stems cylindrical, light green. Ribs 14, very low. Spines needle-like, yellow to grayish. Central spines 2-3, to 5 cm (2 in) long. Radial spines 12-13, radiating, to 3 cm (1.2 in) long. Flowers open at night, funnelform, white, to 20 cm (7.9 in) long. Fruits globose to ovoid, to 2 cm (0.8 in) in diameter. Distribution: Cinti, Chu-quisaca, Bolivia.
Echinopsis candicans (Gillies ex Salm-Dyck) F. A. C. Weber ex D.R.Hunt 1987 Cereus candicans Gillies ex Salm-Dyck 1834, Trichocereus candicans (Gillies ex Salm-Dyck) Britton &Rose 1920
Cereus candicans var. courantii K. Schumann 1897, Trichocereus courantii (K. Schumann) Backeberg 1954, Echinopsis courantii (K. Schumann) H. Friedrich & G. D. Rowley 1974 Trichocereus neolamprochlorus Backeberg 1959 Helianthocereus pseudocandicans Backeberg 1966, not validly published; Trichocereus pseudocandicans (Backeberg) R. Kiesling 1976, not validly published; Echinopsis pseudocandicans (Backeberg)
H. Friedrich &Glaetzle 1983, not validly published
Plants shrubby with many stems, forming clumps 1-3 m (3.3-9.8 ft) in diameter. Stems cylindrical, erect or spreading, rounded apically, light green, to 60 cm (24 in) long and 14 cm (5.5 in) in diameter. Ribs 9-11, low, usually obtuse. Areoles large, white, 2-3 cm (0.8-1.2 in) apart. Spines awl shaped, brownish yellow, somewhat mottled. Central spines several, to 10 cm (3.9 in) long. Radial spines 10 or more, unequal, spreading, to 4 cm (1.6 in) long. Flowers open at night, showy, funnelform, fragrant, white, 18-23 cm (7.1-9.1 in) long, 11-19 cm (4.3-7.5 in) in diameter. Fruits globose to ellipsoidal, dehiscent. Distribution: northern Argentina.
Echinopsis cephalomacrostibas (Werdermann & Backeberg) H. Friedrich & G. D. Rowley 1974. Cereus cephalomacrostibas Werdermann & Backeberg 1931, Trichocereus cephalomacrostibas (Werdermann & Backeberg) Backeberg 1932, Weberbauerocereus cephalomacrostibas (Werdermann & Backeberg) F. Ritter 1981, Haageocereus cephalomacrostibas (Werdermann & Backeberg) P. V. Heath 1995
Plants shrubby, forming dense clumps to 2 m (6.6 ft) high. Stems cylindrical, gray-green, to 10 cm (3.9 in) in diameter. Ribs 8, broad, with transverse furrows. Areoles prominent, crowded apically, brown. Central spines 1-4, very stout, curving backward, interlacing, sometimes angular and channeled, dark brown, becoming gray with age, to 12 cm (4.7 in)
long. Radial spines as many as 20, awl shaped, very short. Flowers open at night, white, to 12 cm (4.7 in) long and 10 cm (3.9 in) in diameter. Fruits globose to oblong, reddish to yellowish orange. Distribution: southern Peru.
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