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THE CACTACEAE. 



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The name Cereus pugioniferus quadrangulispinus Lemaire is given by Forster (Handb. 

 Cact. 395. 1846) as a synonym for C. pugioniferus; Cereus geometrizans quadrangulispinus 

 Xemaire is given only by name by Salm-Dyck (Cact. Hort ' Dyck. 1849. 48. 1850) ; Labouret 

 (Monogr. Cact. 366. 1853) gives Cerens gladiator geometrizans Monville (Cat. 1846) as a 

 synonym for C. geometrizans pugioniferus Salm-Dyck; Cereus arrigens Monville and C. 

 glddiger Lemaire are both given by Labouret (Monogr. Cact. 367. 1853) as synonyms for 

 the variety Cereus geometrizans quadrdngularispinus lycmaire. ^ 



Cereus aquicaulensis (Pfeiffer, Knum. Cact. 90. 1837) is not published, but is given 

 only as a synonym of this species. Cereus quadrangulispinus Lemaire (lyinnaea 19: 363. 



1846) is only a name. 



Cereus garambello Haage in Forster (Handb. Cact. 433. 1846), unpublished, belongs here. 



Illustrations: Boll. R. Ort. Bot. Palermo i:f. i to 4; Contr. U. S. Nat. Herb. 12: 

 pi. 72; Safford, Ann. Rep. Smiths. Inst. 1908: pi. 9, f. 2; pi. 11, f. i. Ber. Deutsch. Bot. Ges. 

 15: pi. 2, f. i; Schumann, Gesamtb. Kakteen f. 23, these last two as Cereus geometrizans. 



Plate XXVI, figure i, is from a photograph taken by Dr. MacDougal near Tehuacdn, 

 Mexico, in 1908. Figure 254 shows a section of a rib and the small fruits of a plant collected 

 by Edward Palmer at San Luis Potosi in 1905 and figure 255 shows its flower. 



2. Myrtillocactus cochal (Orcutt) Britten and Rose, Contr. U. S. Nat. Herb. 12: 427. 1909. 



Cereus cochal Orcutf, West Amer. Sci. 6: 29. . 1889. ■ 



Cereus geometrizans cochal K. Brandegee, Zoe 5: 4. 1900. . 



Plant I to 3 meters high, much branched;. trunk short, woody, sometimes 3 dm. in diameter; 



ribs 6 to 8, obtuse, separated by shallow intervals; spines grayish to black; radial spines 5, short; 



central spines when present 2 cm. long; flowers open night and day, 2.5 cm. long and fully as broad; 



perianth-segments usually 16, .light green, the outer ones tinged with purple, oblong; filaments 



.white; stigma-lobes 5 or 6, white; fruit edible, sUghtly acid, globular, 12 to 18 mm. in diameter, red. 



Type locality: Todos Santos Bay, Lower California: 

 Distribution: Lower California. 



This species is called cochal by the Indians of Lower California, who use the stems 

 for firewood and are said to eat the fruit. 



Illustration: Monatsschr. Kakteenk. 5: 74, as Cereus cochal. 



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■ 3. Myrtillocactus schenckii (J. A. Purpus) Britton and Rose, Contr. U. S. Nat. Herb. 12 : 427. 1909- 



Cerpj jc^encfew J. A. Purpus, Monatsschr. Kakteenk. 19: 38. 1909. 



Tree-like, 3 to 5 meters high, with a very stout trunk and many short ascending branches, 

 dark green ; areoles circular, crowded with black felt, about 5 mm. apart; radial spines 6 to 8, straight, 

 5 to 12 mm. long, black or brownish; central spine i, usually 2 cm. long, sometimes 5 cm. long; 

 fruits small, oblong, 10 to 15 mm. long, naked; seeds black, pitted. 



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Type locality: Sierra de Mixteca, Puebla, Mexico. 



Distribution: Puebla and Oaxaca, Mexico. 



In habit and fruit this species is very similar to the well-known Cereus geometrizans, 



but differs from it greatly in color of stem and in the areoles and spines. 



Illustrations: Monatsschr. Kakteenk. 19:39, as Cereus schenckii; 'Contr. U. S. Nat. 

 Herb. 12: pi. 73. 



Plate XXVI, figure 2, shows a photograph taken by Dr. D. T. MacDougal between 

 Mitla and Oaxaca City in 1906. 



Myrtillocactus eichlamii 



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Branches strongly 6-angled, deep green or slightly glaucous; ribs obtuse; areoles 2 cm. apart, 

 large circtalar, with grayish wool at time of flowering; radial spines 5, bulbose at base; central spine 

 I, a little_ longer than the radials; flower-buds dark purple; outer perianth-segments greenish with 

 roH ur..- ,nn.r ^.r,o.fV, ..,_.„.. creamy white, about 10, spreading almost at right angles to the 



gments 

 tube; stamens numerous, pale, sc 

 flowers fully open at half past nir 

 6 mm. in diameter, wine-colored. 



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