2S0 CERi 



5. lamprochldrus, Lcm. Re 

 taller growth, cyliinlric-L!, :; i 

 in diam., atfirst siiii|.l.-. liiii 

 in new growth liri^-ht L'r> 

 10-11 or occasi.iTKilIy I'l, 

 blunt and but liltl' ■ r. i 

 Hin. apart, yell"\'. i i 

 areola two radiiu 1 1 

 spines 11-14, s],r. 





and 1 



from t 



. di:un., 



curly yellow wool, 

 10, }4-% in. long, 



r V: radial 

 ,Miiuted, about 



inu are strong 



I'-nu; centrals mostly 



I'l deeper colored, with 



, ;ib<iut %m. long : fls. 



1 ■ I", ih. ;Ll)Out 8-10 in. long by 



Art'tntiiie Kcpublic. 



6. Spachiinus, Lem. Stems upright, at first simple, 

 later profusely branching at the base, branches ascend- 

 ing parallel with the main stem, 2-3 ft. high by 2-2'A in. 

 in diam., columnar: ribs 10-15, obtuse, rounded : areola 

 about Kin. apart, large, cove 

 becoming white : radial spines 8-10, 

 spreading, stiff, sharp, amber-yellow to brown; central 

 solitary, stronger and longer; all the spines later be- 

 coming gray : fls. about 8 in. long by about 6 in. in diam., 

 white. Argentine Republic. 



7. ClaiUnsiB,Colla{C.Chilo^nsis,DC.). Stems strong, 

 upright, simple (so far as known), about2J^ ft. high by 

 3X-5 in. in diam., cylindrical to somewhat clarate, 

 bright, clear green: ribs 10-12, obtuse: areolse about an 

 inch apart, large: radial spines straight, sharp, rigid, at 

 first 9, but later 4 others appear above these; centrals 

 mostly 4, seldom but a single one, bulbose at the base; 

 the young spines are brown honey-yellow, becoming 

 white, with dark tips, and finally gray : fls. from the 

 upper lateral areolffi, about 6 in. long, white, resembling 

 those of Echinopsis. Chile. 



CO. Bibs of stem 7-9. 



8. Alamos^nsis, Coult. Upright columnar, about 2 ft. 

 high by about 2 in. in diam., several stems arising from 



root-crown: ribs 7-9, compressed and slightly 

 areolae prominent, about 1-13^ in. apart, hemi- 

 spherical, , densely covered with short, reddish brown 

 wool: radial spines 15-18, slender but rigid, rather un- 

 equal, spreading, straight or curved, %-l in. long, ashy 

 gray; centrals commonly 4, much stouter and longer, 

 the three upper ones erect or divergent, the lowest (usu- 

 ally the longest and somewhat flattened), porrect or 

 deflexed, all more or less angular, sometimes teretish, 

 lK-2 in. long, when young yellowish, with dark brown 

 base, finally becoming gray: fls. from the upper lateral 

 areolae, funnel-form, about 1% in. long, red. Northern 

 Mexico. 



9. Queretarfinsis, Weber. Arborescent, with a trunk 

 about 3 ft. high by about 14 in. in diam.; the much- 

 branched crown has a diameter of 12-16 ft., the total 

 height of a plant being about 20 ft.; branches dark 

 green, in young growth froquontly of a peculiar violet- 

 brown: ribs 6-7, si-|i;ir:iti(l liy sharp grooves, which later 

 become much flattt-tuMl, :iii<l ihr stem consequently more 

 cylindrical : areoltc ilii>rc'ssi-.l, liark brown : radial 

 spines 6-9, the lower om-s the longest, about 1% in. 

 long ; centrals 4 (often but 2), reaching IK in.: fls. nu- 

 merous from the upper part of the branches, about 4-5 

 in. long : fr. yellow to red, about 2 in. long, covered with 

 dark yellow to brown spines, about 1 in. long, and bul- 

 bose at the base. Mexico. 



10. ChiotiUa, Weber. Arborescent, stem reaching a 

 diameter of 16 in., freely branching from the base up- 

 ward, the whole plant reaching a height of 16 ft., with a 

 crown 12-14 ft. in diam., branches 8 in. in diam., dark 

 green: ribs mostly 7 (seldom 8); areolie elliptical, 

 pointed above and below, large, gray : radial spines 

 10-15, straight, very stiff, radiate, H-Vs in. long ; cen- 

 trals 1-2, rarely 3-4, the under one long and very strong, 

 about 2 in. long, curved downward, and either to the 

 right or to the left, the others about half as long ; all 

 the spines are horn colored ; the narrow groove con- 

 necting the areolae bears a few bristles : fls. from the 

 lateral areolie, near the end of the branches, IK-IH in. 

 long, sulphur-yellow: fr. spherical, little more than an 

 inch in diameter, scaly, brown-red, with a violet flesh 

 within. Mexico. 



CEREUS 



11. atellitus, Pfeiff. (r.D.vcAii.Mart. C.TonelliAnus, 

 ',.■ jn. . Sieins upright, columnar, 10-14 ft. high, light 



1 r.iiiches upright, 2-3 in. in diam.: ribs 7-10, 

 III I : areolte K-1 "i- apart, sunken between adja- 

 II III !• liiMiisof the rib: radial spines 8-10, about %m. 

 lung; leiitrals ;i-5, the upper ones upright or divergent, 

 the under one porrect, about i4-% in. long ; all the 

 spines bulbose at the base, rigid, white, and sometimes 

 with dark tips, turning gray with age : fls. forming a 

 crown at the end of the stem, about 2 in. long, light 

 pink : fr. spherical, IJ-, in. in diam., red outside and 

 carmine-red within. Central Mexico. — Fruit edible and 

 common in the Mexican markets. 



12. euphorhioldes. Haw. (f. 6//e»-sti, Otto), ('uhimnar, 

 simple, 10-lU ft. high by about 4K in. in .liani.. m Mnuig 

 growth pale green, changing with atre i" ;^i:i\ ^t. i ti : 

 ribs 8-10, separated by sharp grooves. ^li:n p .mLjl. .1. I.e. 

 coming flattened in older growth : arenl.e .lIkiui 'sin. 

 apart, small, white to gray: radial spines tnostly (1, the 

 under one the longest, reaching a length of over an 

 inch, strong, yellowish brown to black, the upper ones 

 shorter and bristle form ; central solitary, in young 

 plants twice as long as the radials; all the spines finally 

 become gray: fls. from near the crown. 3K^ in. long, 

 beautiful flesh-red, remaining open for 24 hours. Brazil. 

 R.H. 1885,p.279. 



13. Boezlii, Haage. Upright, coluninnv, nlvnit :'. in. 

 in diam.: ribs 9, separated by sharp, - ' — ' ■ • ■ ; ■ n- 

 tine grooves, obtuse; above the areeln . i lu', 

 slightly curved grooves form a letter \ . , i- .. -i 

 in.~ apart, comparatively large, slightly mli i , _\i 11 w- 

 ish, later gray: radial spines 9-12, radiat<*, nenrly Kin. 

 long, straight, subulate, tolerably sharp, slightly'thick- 

 ened at the base, clear brown, with darker stripes; cen- 

 tral solitary, reaching IK in. in length, straight, porrect, 

 later somewhat deflexed, clear brown: later all the spines 

 become gray. Andes of Peru or Equador. 



14. tetraointhus. Lab. Upright, arborescent or 

 busliy, freely branching, young branches leaf-green, 

 Intel- L'i:i> Liiiii : ribs 8-9, low, arched: areolro me- 



dii :i illy sunken, about Kin. apart, white to 



gr;i> iii :' i III- 7, radiate, about %in. long, straight, 

 svilniiiii , -ii.iii , wliite, with brown tips and bases, later 

 ashy K''a\ i eeiiii.-ils 1-3, under one largest and porrect, 

 when young yellow and translucent, later gray: fls. re- 

 semble those of O. tortHosus. Bolivia. 



ccc. Kibs of stem S-G. 



15. marginitus, DC. (C. ;ieiiii,i,yiis. Zu.e.). Simple 

 or branching at apex, 2-3 in. in iliiiin.. wiili .*)-6 obtuse 

 ribs, which are woolly their wlmli l.n^ili: s| lines short- 

 conical, rigid, 7-9, all nearly nliki-: lis. lirmMiish purple, 

 about IK in. long : fr. globular and spiny. Mexico.— 

 Frequently used for hedges in S. Mexico. The stem is 

 often covered with a woody crust. 



16. BumoTtidri, Salm-Dyck. Tall, strong, 6-angled, 

 columnar stems, much resembling C. marginatiis, but 

 with the confluent areolte armed with slender, needle- 

 form, yellow spines: radials about 9-15, radiating, about 

 %-% in. long ; centrals 1-4, the under one longest, 

 reaching IK in. in length : fls. numerous, funnel-form, 

 about 2 in. long, opening to about 1 in. in diam., white. 

 Mexico. 



17. Hanke&nus, Weber. Upright, robust, not branch- 

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

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

 about IK in. high, conspicuously crenate, with an S-forra 

 line passing from each areolae toward the center of the 

 stem : areohe '„-l in. apart, horizontally elliptical to 

 lieai-i li ir I, liinvii, becoming gray below and yellow 

 iili"\ I III s :i, needle-like, stout, sharp-pointed, 

 alii'ii iiiilier-colored when young, turning to 

 bri.wii ; 1. iiMii -.ilitary. Straight, porrect, %in. long, 

 Ktruniiei- iliau ilie radials, hom-colored ; later all the 

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



BB. N'etv growth blue, white- or gray-jiruinose 



(i.e., covered with a bloom). 



c. Ribs of stem comparativeh/ broad and low : more or 



less triangular in transverse section. 



18. macr6gonu3, Otto. Arborescent, sparsely branch- 

 ing, reaching a heigh of 20 ft. (in cultivation, 6 ft. high 



