Cereus thelegonus Weber in Schumann, Gesamtb. Kakteen 78. 1897.
Stems procumbent or sometimes with erect branches, elongated, 4 to 10 dm. long, dark green, cylindric, 4 to 7.5 cm. in diameter; ribs 12 or 13, broad and obtuse, divided into prominent, more or less distinctly 6-sided tubercles; areoles circular, felted; spines at first brown, some turning gray, others black; radial spines 6 to 8, acicular, somewhat spreading, 1 to 2 cm. long; central spine solitary, porrect, 2 to 4 cm. long; flowers white, about 20 cm. long, funnelform; outer perianth-segments greenish; axils of scales on flower-tube long-woolly; fruit about 5 cm. long, hairy, red, splitting on one side; seed black.
Type locality: Tucuman, Argentina.
Distribution: Northwestern Argentina.
This species has heretofore been unknown to us, but fine specimens, both living and for the herbarium, were obtained by J. A. Shafer at Tapia, Tucuman, near the type locality, February 9, 1917 (No. 98).
Illustration: Schumann, Gesamtb. Kakteen f. 14, as Cereus thelegonus.
Figure 188 is from a photograph of a flowering branch in the garden of Dr. Spegazzini at La Plata, Argentina; figure 189 is from a photograph of the wild plant taken by Dr. Shafer in 1917 at Tapia, Argentina.
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