280 



CEREUS 



CEREUS 



5. lamprochldrus, Lem. Related to C. candicans . of a 

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

 in diam., at first simple, but later branching at the base; 

 in new growth bright green, later dirty green : ribs 

 10-11 or occasionally 15; conspicuously crenate, later 

 blunt and but little crenate: areolse medium size, about 

 %in. apart, yellowish white, becoming gray; 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 %in. long : fls. 

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

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



6. Spachianus, 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% in. 

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

 about %in. apart, large, covered with curly yellow wool, 

 becoming white : radial spines 8-10, 34-% 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. Chilensis, Colla ( C. Chiloensis, DC. ) . Stems strong, 

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

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

 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 areolae, about 6 in. long, white, resembling 

 those of Echinopsis. Chile. 



co. Ribs of stem 7-9. 



8. Alamosensis, 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: areolse prominent, about 1-1% 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, 

 134-2 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. Queretarensis, 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 the stem consequently more 

 cylindrical : areolse depressed, dark brown : radial 

 spines 6-9, the lower ones the longest, about 134 in. 

 long ; centrals 4 (often but 2), reaching 1% in.: fls. nu- 

 merous from the upper part of the branches, about 45 

 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. Chiotilla, 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): areolse elliptical, 

 pointed above and below, large, gray : radial spines 

 10-15, straight, very stiff, radiate, 34-% 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 areolse bears a few bristles : fls. from the 

 lateral areolse, near the end of the branches, 134-1% in. 

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

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

 within. Mexico. 



11. stellatus, Pfeiff. ( C. Df/ckii, Mart. C.Tonellianus, 

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

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

 rarely 15 : areolse %-l 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, 1% in. in diam., red outside and 

 carmine-red within. Central Mexico. Fruit edible and 

 common in the Mexican markets. 



12. euphorbioides, Haw. (C. Olfersii, Otto). Columnar, 

 simple, 10-16 ft. high by about 4% 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 : areolse 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-red, remaining open for 24 hours. Brazil. 

 R.H. 1885, p. 279. 



13. EoBzlii, Haage. Upright, columnar, about 3 in. 

 in diam. : ribs 9, separated by sharp, somewhat serpen- 

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

 slightly curved grooves form a letter V: areolae %-% 

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

 ish, later gray: radial spines 9-12, radiate, nearly %in. 

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

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

 tral solitary, reaching 1% in. in length, straight, porrect, 

 later somewhat deflexed, clear brown ; later all the spines 

 become gray. Andes of Peru or Equador. 



14. tetracanthus, Lab. Upright, arborescent or 

 bushy, freely branching, young branches leaf -green, 

 later gray-green : ribs 8-9, low, arched : areolse me- 

 dium sized, slightly sunken, about %in. apart, white to 

 gray: radials 5, later 7, radiate, about %in. long, straight, 

 subulate, stout, white, with brown tips and bases, later 

 ashy gray; centrals 1-3, under one largest and porrect, 

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

 semble those of C. tortuosus. Bolivia. 



ccc. Ribs of stem 3-6. 



15. marginatus, DC. (C. gemmatus, 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 1% in. long : fr. globular and spiny. Mexico. 

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

 often covered with a woody crust. 



16. Dumortieri, 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 1-4, the under one longest, 

 reaching 1% in. in length : fls. numerous, funnel-form, 

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

 Mexico. 



17. Hankeanus, 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 134 in. high, conspicuously crenate, with an S-form 

 line passing from each areolse toward the center of the 

 stem : areolae %-l in. 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, %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-prulnose 



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



C. Ribs of stem comparatively broad and low ; more or 

 less triangular in transverse section. 



18. macrdgonus, Otto. Arborescent, sparsely branch- 

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



