I So THE CACTACEAE. 



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

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

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

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

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

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

 the variety Cereus geometrizans quadrangularispinus Lemaire. 



Cereus aquicaidensis (Pfeiffer, Enum. Cact. 90. 1837) is not published, but is given 

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

 1846) is only a name. 



Cereus garambcllo 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 Cact. 433. 1846), unpublished, belongs here.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. n, 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 Tehuaciin, 

 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. 



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

 Cereus cochal Orcutt, West Amer. Sci. 6: 29. 1889. 

 Cereus geometrizans cochal K. Branclegee, 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, slightly 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. 



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



Cereus schenckii 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. 



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 ( 'crcits geometrizans, 

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



Illustrations: Monatsschr. Kak.'eenk. 19:39, as Cereus sclienckii; 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. 



4. Myrtillocactus eichlamii sp. nov. 



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

 large, circular, 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 

 red tips; inner perianth-segments creamy white, about 10, spreading almost at right angles to the 

 tube; stamens numerous, pale, somewhat spreading; style white, a little longer than the stamens; 

 llowi-rs fully open at half past nine o'clock in the morning, deliriously fragrant; fruit small, globular, 



6 mm. in diameter, wine-colored, naked except a few small scales. 



