CEREUS 



by 3-5 in. in diam.), brin 1 

 columnar : ribs mostl\ 

 dom 8-9, thick, slightly un ] 

 late, obtuse and with conv 

 faces, about 1 in. high blu 

 green, frequently having a 

 pressed line near the areol 

 areolae about >2in. apart Hr 

 gray: radial spines 6-9 ra 

 ate or spreading, strong 

 ulate, Hm. long, horn col 

 later black ; central "sp r 

 1-3, somewhat stronger a 

 longer than the radial 

 or less conspicuously porrect 

 lis. from the lateral reolt- 

 ncar the end of the In i 1 

 2V^-3iu. long.tolerabl fle 1 

 white : fr. depressed-f,lob 

 2 in. in diam. by little 

 than 1 in. long. Braz 1 

 C. Picten - aboi g 

 Wats., is closely allie i i 

 above. It is Sonoran, b 

 known to be in cult 

 7:335. 



19. ebiSrneus, Sain D k 

 ((;. p«<i«d.s-«s, Otto. ( ^1 

 ?is, Hort.). Stem simple an! 

 glaucous, with 7-10 r I b 

 spines subulate, rigid i orj 

 white, with black tip (purpl sh when young) 

 radials 8-10, central ally solitary ( 

 times 3-4): fls. purpl 1 W Ind Mex 

 Cent Amer., S.Amer 



20. geometrizana, Mart {C p iq m fer s Lem ) S m 

 pie, 4 in. in diam., with o-9 obtuse ribs with 1 roal in 

 tervals : spines 3-6, ui eq lal stout and black h the 

 solitary central one (somet lues want ng) verj long and 

 stout: fls. pinkish wh te abo 1 1 m long and in broad 

 Mexico. 



21. CAchal, Orcutt. Stout at base, and repeatedly 

 forking above, becoming 4-10 ft. high: ribs 4-8, obtuse, 

 with wide, shallow intervals : spines few and stout, the 

 solitarv central one «t..iit."Jt : tl^. purplish green, 1-1 H 

 in. long : fr. the siz- hhI -Ii h^ ^f an olive, not spiny, 

 red (frequently gra} I ; ■ ; liUrown). L. Ualif.— 

 The short and stc.iit i , ;^ often 1ft. in diam., 

 the long branches _-- m. ;ii iMn.. 



CC. Hihs of stem struH'jly compressed lateralUj. 



22. Peruvianus, Haw. (C. monocldnos,T>C.). Hedge 

 Cactus. Tall, 30-50 ft., branching freely toward the 

 base, columnar, J^8 in. in diam., new growth dark green 

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

 old stems, becoming corky: ribs 5-8, compressed : are- 

 olte K-1 in. apart, in new growth covered with con- 

 spicuous, curly brown wool, becoming gray : radial spines 

 about 6-7, about %-% in. long ; central sMlitary, narh- 

 ing a length of 2% in.; the number i.f -iiiii. - in. i,a-es 

 with age to as many as 20. all are ri-i.l. liiiwn : tls. 

 abundant, from the lower part of th.- ^ 

 turnal, 6-7 In. long bv 5 in. in diam. Flc 

 and S. Amer. G.C. Ill, 24: 175 (var. mo, 



Vtff. Alacriportanus, K. Sch. (C. AlacriportAmis, 

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

 spicuously pruinose in the new growth, which is con- 

 sequently nearly clear green. S. Brazil. 



23. Janiaoa.ru, Salm-Dyck (C. ™'h(f«s. Haw.). Stems 

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

 in diam.; young growth azure-bhic. Tnriiiiv.- ilarlc ^rreen 



with age, glaucous: ribs 4-0. thin. imh,... ! . i . .. ,t(-: 



radial spines 5-7, stiff, neqdie-lili' , . . Aitli 



brown points, or brown and linally I'll I . liii. 



long; centrals 2-4, somewhat stronj," r, ["ii.t. i :i in. 

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

 turnal. Braz., Venezuela. 



24. candelabrum, Weber (C. BeUeicU, Hort.). Tall, 

 columnar, simple or branching only at the base, dark 

 green with a faint trace of blue, 30 ft. high by 4 in. in 

 diam.: ribs 9, blunt, strongly compressed, %in. high, 

 slightly crenatp : areolae 1-2 in. apart, ovate, large. 



, Mes. 



white: radial spines mostly 9, the under ones longest 

 and about an inch long, laterally compressed, the upper 

 ones shorter, round, all bulbose and black at the base, 

 ivory-white above ; central solitary, very large, 3-4 in. 

 long, dagger-like, laterally compressed and faintly an- 

 gled, porrect, ivory-white to gray, base black and 

 strongly bulbose : fls. from the lateral areolae, 3-4 in. 

 long, white: fr. the size of a small orange, covered with 

 small scales, in the axils of which are wool and bristles 

 Mexico. 



25. ohalybsus, Otto. Stems upright, branching above, 

 arborescent, azure blue and pruinose, later dark green, 

 ly^-i in. in diam.: ribs 6, in young growth very much 

 compressed, later depressed till the stem is nearly cy- 

 lindrical : areolae about %in. apart, dark gray-brown ; 

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

 similar but somewhat stronger and 

 the spines are pointed, stiff, wlieu 

 later brown to gray with black tip<. 1 

 fls. very similar to those of C. c" /" 

 Republic. 



AA. Stems erect, less fluiii J 

 B. Sibsofstem 10 '■,- 



26. serpentinus, DC. Stems <"hii 

 flexuose. 5-8 ft. high by l-lJ„in. iu 

 the point : ribs 10-13, low, obtuse 



all 

 re black, 

 the base: 

 Vigentine 



slender, 



ubout %i: 



.part: radial spines 10-12, slender.needle form, stiff,%ln. 

 long ; centrals 1-1, pink and white when young, later 

 gray ; the number of spines increases by new ones ap- 

 pearing later : fls. from the upper lateral areolae, slen- 

 der, green, spiny tube with funnel-shaped corolla, about 

 6 in. long by 3 in. in diam., white, nocturnal: fr. ovoid, 

 red, covered with deciduous spines. Cent. Mex. B.M, 

 3566. 



27. Bailmannii, Lem. (C. colubrlnus, Otto). Stems 

 dark green, slender, flexuose, columnar, reaching a height 

 of 6 ft. and a diam. of 1-lK in., the few branches ascend- 



