CEREUS 



CEREUS 



723 



ccc. Ribs of st. 3-6. 



9. Hankeanus, Web. Upright, robust, not branch- 

 ing (so far as known), young growth bright green, later 

 dark green, about 2 in. diam.: ribs 4-5, compressed, 

 about \}4: in. high) conspicuously crenate, with an S- 

 form line passing from each areole toward the center of 

 the st. : areoles, %-l m - apart, horizontally elliptical to 

 heart-shaped, brown, becoming gray below and yellow 

 above: radial spines 3, needle-like, stout, sharp-pointed, 

 about %in. long, amber-colored when young, turning 

 to brown; central solitary, straight, porrect, 5^in. long, 

 stronger than the radials, horn-colored; later all the 

 spines become gray: fls. 4-5 in. long, white. S. Amer. 



BB. New growth blue, white- or gray-pruinose. 



c. Ribs of st. comparatively broad and low: st. more or 



less triangular in cross-section. 



10. macrogdnus. Otto. Arborescent, sparsely branch- 

 ing, reaching a height of 20 ft. (in cult., 6 ft. high by 

 3-5 in. diam.), branches columnar: ribs mostly 7, sel- 

 dom 8-9, thick, slightly undulate, obtuse and with 

 convex faces, about 1 in. high, bluish green, frequently 

 haying a depressed line near the areole: areoles about 

 3^in. apart, large, gray: radial spines 6-9, radiate or 

 spreading, strong, subulate, Min. long, horn-color, later 

 black ; central spines 1-3, somewhat stronger and longer 

 than the radials, more or less conspicuously porrect: 

 fls. from the lateral areoles near the end of the branches, 

 2^-3 in. long, tolerably fleshy, white: fr. depressed- 

 globose, 2 in. diam. by little more than 1 in. long. 

 Brazil. 



cc. Ribs of st. strongly compressed laterally. 



11. peruvianus, Haw. (C. monoclonos, DC.). HEDGE 

 CACTUS. Fig. 884. Tall, 30-50 ft., branching freely toward 

 the base, columnar, 4-8 in. diam., new growth dark green 

 and glaucous, becoming a dull green with age, and, in 

 old sts. becoming corky: ribs 5-8, compressed: are- 

 oles K-l in. apart, in new growth covered with con- 

 spicuous, curly brown wool, becoming gray: radial 

 spines about 6-7, about ^-^in. long; central solitary, 

 reaching a length of 2% m -> the number of spines in- 

 creases with age to as many as 20, all are rigid, brown: 

 fls. abundant, from the lower part of the st., white, noc- 

 turnal, 6-7 in. long by 5 in. diam. S. Amer. G.C. III. 

 24 : 175 (var. monstrosus) . 



Var. Alacriportanus, K. Schum. (C. Alacriportanus, 

 Mart.) . Of somewhat weaker growth, low, and less con- 

 spicuously pruinose in the new growth, which is con- 

 sequently nearly clear green. S. Brazil. 



12. Jamacaru, Salm-Dyck (C. vdlidus, Haw.). Sts. 

 upright, robust, rigid, 12-16 ft. high by as much as 6 in. 

 diam.; young growth azure-blue, turning dark green 

 with age, glaucous: ribs 4-6, thin, compressed, crenate: 

 radial spines 5-7, stiff, needle-like, clear yellow with 

 brown points, or brown and finally black, about %-% 

 in. long; centrals 2-4, somewhat stronger, porrect, 

 %-3 in. long: fls. large, 10 in. long by 8 in. diam., white, 

 nocturnal. Brazil, Venezuela. 



13. chalybabus, Otto. Sts. upright, branching above, 

 arborescent, azure-blue and pruinose, later dark green, 

 1K~4 in. diam.: ribs 6, in young growth very much 

 compressed, later depressed till the st. is nearly cylin- 

 drical: areoles about %in. apart, dark gray-brown: 

 radial spines mostly 7, about l Am. long; centrals 3-4, 

 similar but somewhat stronger and a little longer; all 

 the spines are pointed, stiff, when young are black, 

 later brown to gray with black tips, bulbose at the 

 base: fls. very similar to those of C. cxndescens. 

 Argentina. 



AA. Sts. erect, less than 2 in. diam. 

 B. Ribs of st. 10 or more. 



14. isogonus, K. Schum. St. upright, columnar, about 

 1-1 J^ in. diam., in young growth light green to yellow- 

 green, later darker: ribs 15-16: areoles approximate, 



white, turning gray: radial spines as many as 20, spread- 

 ing, at first clear or dark yellow, becoming white, and 

 finally gray, bristle form, flexible, about %in. long; 

 centrals 6-8; two of these are somewhat stronger and 

 stiff er, about %in. long, one directed upward and one 

 downward, yellowish brown to dark honey-color; later 

 gray, as in the radials. S. Amer. 



15. splendens, Salm-Dyck. Columnar, slender, 

 short, rigid, more or less branching from the base, 

 reaching a height of about 2 ft. and about 1-1 % in. 

 diam., light to yellowish green: ribs about 10-12, 

 rounded: areoles prominent, about J^in. apart, tawny, 

 becoming white, tomentose: radial spines 8-12, radiat- 

 ing, yellow and light brown, becoming gray; centrals 

 1-3, scarcely larger than the radial, yellowish to white; 

 all the spines slender, bristle form, about J4-%in. long. 

 . Cavendishii has been referred to this species, but 

 with some question. 



BB. Ribs of st. 3-10. 



16. platygdnus, Otto. At first upright, later some- 

 what reclining, branching, at the base about 1 in. 

 diam., tapering in the new growth: ribs 8, low, arched: 

 areoles about M m - apart, very small, yellow, becoming 

 gray, subtruded by a small 3-angled bract: radial 

 spines 12-15, spreading, bristle form, little more than 

 Kin. long; central solitary, slightly longer and stronger; 

 all the spines at first yeflow-brown, changing to white 

 or gray with age. 



17. caerulescens, Salm-Dyck (C. Ldndbeckii, Phil.). 

 Arborescent or shrubby, 3-5 ft. high: sts. 1-1 K in. 

 diam.: ribs usually 8, obtuse: areoles approximate, 

 white bud soon becoming black: spines rigid; radials 

 9-12, M-Min. long, black; centrals 4, %in. long, 

 stronger, black or white: fls. from the side of the st., 

 slightly curved, 6-8 in. long by 6 in. diam., tube bronze- 

 green, corolla white or occasionally rose-pink: frs. 

 ellipsoidal, pointed at both ends, about 3 in. long and 

 half that in diam., bright red, with blue glaucous cover- 

 ing. Argentina. B.M. 3922. 



18. Bridgesii, Salm-Dyck. Upright, tall, columnar, 

 simple or later branching at the base, bright green when 

 young, becoming blue to gray-green, 1^-2 in. diam.: 

 ribs 5-^7, very broad and low: areoles ^>-%in. apart, 

 yellowish to gray: spines 3-5, radiating, the under one, 

 or seldom the upper one, the longest, IK in. long, stiff, 

 sharp, straight, dark honey-yellow, with brown tips, 

 becoming gray with age. Bolivia. 



Var. lageniformis, K. Schum. (C. lagenifdrmis, Forst.). 

 Spines more numerous, somewhat longer. 



19. azftreus, Farm. (C. Seidelii, Lehm.). St. upright, 

 tall, slender, columnar, branching from the base, in the 

 young, fresh bluish green, later dark green with gray, 

 glaucous covering, about 3-4 ft. high and about 1 in. 

 diam.: ribs 5-7, rounded, enlarged at the areole: 

 areoles about %-l ft. apart, elevated, large, abundantly 

 woolly when young: spines 8-18, nearly alike, about 

 J^-^in. long, stiff, slender, needle-form to bristle-like, 

 black; the 2^4 central ones somewhat longer: fls. 8-12 

 in. long, obliquely attached to the st., slightly curved, 

 white. Brazil. 



20. csesius, Otto. Upright, columnar, branching at 

 the base, somewhat tapering above; in new growth, 

 beautiful light blue, pruinose; later, light green to 

 slightly bluish, about 1^ in. diam.: ribs 5-6, separated 

 by sharp grooves, about ^in. high, compressed, faintly 

 crenate, becoming depressed in older growth: areoles 

 about ^in. apart, small, yellow at first, later becoming 

 white and finally gray: radial spines 8-10, sometimes 

 more appear later; radiate, light amber-color, brown at 

 the base, the lower pair the longest, mostly about ^in. 

 long; centrals 4-7, like the radials but usually some- 

 what stronger, longer and darker; all the spines thin, 

 needle-form, flexible, sharp; later, light, horn-color,, 

 finally gray. S. Amer.(?). 



