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By N. L. Britton, J. N. Rose

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1834. landbeckii Philippi in Regel, Gartenflora 24: 162. 1875. coerulescens landbeckii Schumann, Gesamtb. Kakteen 122. 1897. coerulescens melanacanthus Schumann, Gesamtb. Kakteen 122. 1897. Stems bluish green to purplish, 1 to 2 meters high, usually much branched; joints 3 dm. long or more, somewhat tapering toward the apex; ribs 7 or 8, low, somewhat tuberculate, obtuse or rounded, separated by acute intervals; areoles large, black; radial spines about 9 or even more, black, at least at bases and tips; central spines usually solitary, a little stouter than the radials, ascending; flower long, tubular, 22 cm.

17. 18. Perianth-segments retuse . . . . . . . . . . . . . . . . 19. Spines subulate; berry small. . . . . . . . . . . . . . . . 20. Flowering areoles definitely long-woolly. Ribs 5 to 13, separated by narrow valleys. Ribs 8 mm. high or higher. Plant light green to dark green. Spines short, subulate. . . . . . . . . . . . . . . . 21. Spines slender, acicular. Wool of flowering areoles sparse, not matted . . . . . . 22.

Ed. 3. 285. 1839. Described as horizontal with stems of 5 or 6 angles. Cereus amblyogonus G. Don in Sweet, Hort. Brit. ed. 3. 284. 1839. Described as “blunt angled” and introduced from South America. Cereus caudatus Gillies in Sweet, Hort. Brit. ed. 3. 285. 1839. Described only as “tailed” and introduced from Chile in 1828. Cereus longifolius Karwinsky in Sweet, Hort. Brit. ed. 3. 286. 1839. ” Cereus de laguna Haage in Förster, Handb. Cact. 433. 1846. Said to be similar to C. geometrizans and C.

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