280 



CEREUS 



5. lamproclU6rus, Lem. Related to C. candicans . vt a 

 taller growth, cylindrical. 3-6H ft. high by about 3 in. 

 in diara., at first simple. Imt later brfuiciiing at the base; 

 in new L'n.wtli t.ri-lit lt.-.-ii. Int.-r .lirty green: ribs 



10-11 or i..-i-;i-i.iii:[||y 1 :. ; i -i.i.'u. .u^ly i-ri-nate, later 



blunt aiKl l.ut li:tl,- , ivii,ii'>: ar."l:i- in.-.liinii size, about 

 3^in. apart, yrlli.wish whitr. iMrniiiini,' irruy ; above each 

 areola two 'radiating grooves form a letter V: radial 

 spines 11-14, spreading, straight, sharp-pointed, about 

 %in. long, clear to dark amber color; some are strong 

 and rigid, while others are bristle-form ; centrals mostly 

 4, somewhat longer, stronger and deeper colored, with 

 brown bases, becoming dark gray, about Kin. long : fls. 

 from the previous year's growth, about 8-10 in. long by 

 6 in. in diam., white. Argentine Republic. 



6. Spachi4ims, Lem. Stems upright, at first simple, 

 later profusely branching at the base, branches ascend- 

 ing parallel with the main stem, 2-.*^ ft. high by 2-23^ in. 

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

 about Kin. apart, large, covered with curly yellow wool, 

 becoming white : radial spines 8-10, ^4-% in. long, 

 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. Chilinsis, Colla(C.C;iiZoi?n«i«,DC.). Stems strong, 

 upright, simple (so far as known), about 2>2 ft. high by 

 3H-5 in. in diam., cylindrical to somewhat clavate, 

 bright, clear green: ribs 10-12, obtuse: areolae 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 : rts. from the 

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

 those of Echinopsis. Chile. 



CC. Bibs of stem 7-9. 



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

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

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

 crenate: areolae prominent, about 1-1 K 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 



luich stouter and longer, 

 ^■'■iit, the lowest (usu- 

 ! ittened), porrect or 

 ^i>metimes teretish, 

 i-li, vrith dark brown 

 rom the upper lateral 

 long, red. Northern 



gray; centrals comnm 



the three upper on. • 



ally the longest n 



deflexed, all mor. 



lX-2 in. long, win n 



base, finally beconimL; i;ray 



areola, funnel-form, about 



Mexico. 



9. Queretar^nsis, 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 frequently of a peculiar violet- 

 brown: ribs 6-7, separated by sharp grooves, which later 

 become much flattened, and tin' stmi i-,,iis(([uently more 

 cylindrical: areolte depri-s.-.M|. duk l.r.nvn: radial 

 spines 6-9, the lower ones rhe I-'Iilt'-t. rihout IH in. 

 long; centrals 4 (often but L' * , r.ac-iiiiii: !'_. 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. Chiotllla, 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): areote elliptical, 



"il spines 

 ng ; 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 areoliB bears a few bristles : fls. from the 

 lateral areolse, near the end of the branches, lM-13'2 in. 

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

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

 within. Mexico. 



CEREUS 



11. stell4tus, Pfeiff. (C./).vcia,Mart. C.TonelHcinut, 

 Lem.). Stems upright, columnar, 10-14 ft. high, light 

 green ; branches upright, 2-3 in. in diam. : ribs 7-10, 

 rarely 15 : areolae J^-1 in. apart, sunken between adja- 

 cent swellings of the rib: radial spines 8-10, about %in. 

 long; centrals 3-5, the upper ones upright or divergent, 

 the under one porrect, about %-% 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, \}4 in. in diam., red outside and 

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

 common in the Mexican markets. 



12. euphorbioldes, Haw. (C 6;/^er.9!(, Otto). Columnar, 

 simple, 10-16 ft. high by about iM in. in diam., in young 

 growth pale green, changing with age to gray-green : 

 ribs 8-10, separated by sharp grooves, sharp-angled, be- 

 coming flattened in older growth : areolae about %in. 

 apart, small, white to gray: radial spines mostly 6, 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, 3}^-4 in. long, 

 beautiful flesh-n-.l. nniaining open for 24 hours. Brazil. 

 K.H. 1885,p.L>7:i. 



13. BoBzlii, Haaur. l"|.ri-lit, columnar, about 3 in. 

 in diam.: ribs I), sii.arattd by sharp, somewhat serpen- 

 tine grooves, obtuse; above the areolae, two radiating, 

 slightly curved grooves form a letter V : areolae ]4Si 

 in. apart, comparatively large, slightly sunken, yellow- 

 ish, later gray: radial spines 9-12, radiate, nearly 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. tetrao4nthus, Lab. Upright, arborescent or 

 bushy, freely branching, young branches leaf-green, 

 later srray-erpen : ribs 8-9, low, arched : areolae me- 

 dium si7,.,i, s|iir|,tlv sunken, about Kin. apart, white to 

 gray: ri.li ,'- ", hiT. ,• 7, radiate, about %in. long, straight, 

 suIhi I 1 1, with brown tips and bases, later 

 a.sh> . . i-:{, under one largest and porrect, 

 wli'-n .'■iiii^' \ri;>.\v and translucent, later gray: fls. re- 

 semble thiisi- of ('. tnrtuosus. Bolivia. 



ccc. Uibs of utem S-G. 



15. marginatus, DC. (C. gemmiltiis, Zucc). Simple 

 or branching at apex, 2-3 in. in diam., with 5-6 obtuse 

 ribs, which are woolly their whole length: spines short- 

 conical, rigid, 7-9, all nearly alike: fls. brownish 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. Dtunorti^ri, Salm-Dyck. Tall, strong, 6-angled, 

 columnar stems, much resembling C. marginatus, but 

 with the confluent areolae armed with slender, needle- 

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

 %-% in. long ; centrals 1^, 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, about2 in. in diameter: ribs 4-3, euniprf ssed. 

 about 1/4 in. high, conspicuously crenati. \\ iMi anS f-.nn 

 line passing from each areolae toward tin . ■. : . i M . 

 stem: areolae %-l in. apart, horizontal 



heart-shaped, brown, becoming gray 1" I ■. ..;,.a 



above: radial spines 3, needle-like, stout, .^Laip puiutci. 

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

 brown ; central solitary, straight, porrect, %in. long, 

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

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



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



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



c. nibs of stem comparatively broad and low ; more or 



less triangular in transverse section. 



18. macrfigonus. Otto. Arborescent, sparsely branch- 

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



