14 



THE .CACTACEAE. 



referred plate 4084 of Curtis's Botanical Magazine with the name Cereus pitajaya, although 

 its flowers are smaller and the inner perianth-segments are more serrate. 



While this species is somewhat similar to the common low Cereus pernambucensis of 

 the Brazilian coast, it is stouter, often reaching a height of 4 meters, and has much larger 

 flowers. 



Cereus glaucus speciosus (Pfeiffer, Enum. Cact. 106. 1837) is referred to Cereus varia- 

 bilis by both Pfeiffer and Riimpler. C. brandii (Salm-Dyck, Cact. Hort. Dyck. 1849. 49. 

 1850) and C. colvillii (Riimpler in Forster, Handb. Cact. ed. 2. 736. 1885) of English gar- 

 dens are also referred here. 



C. variabilis glaucescens Salm-Dyck, var. laetevirens Salm-Dyck, var. micracanthus Salm- 

 Dyck, var. salm-dyckianus, and var. obtusus are all given by Walpers (Repert. Bot. 2: 

 277. 1843) as synonyms of this species. The last name probably should be referred to 

 Cereus obtusus. The varieties gracilior and ramosior (Salm-Dyck, Cact. Hort. Dyck. 1849. 

 49. 1850) are only names. Of this relationship is Cereus grandis Haworth (Suppl. PI. 

 Succ. 76. 1819) and its two varieties gracilior Salm-Dyck and ramosior Salm-Dyck (Labou- 

 ret, Monogr. Cact. 376. 1853). 



Cereus prismatiformis, C. hexangularis, and C. affinis (Pfeiffer, Enum. Cact. 106. 1837) 

 were all given as synonyms of Cereus variabilis. 



Illustrations: Pfeiffer, Abbild. Beschr. Cact. 2: pi. 15, as Cereus variabilis; Vellozo, 

 Fl. Flum. 5: pi. 23, as Cactus tetragonus. 



Fig. 14. — Cereus pernambucensis. 



16. Cereus pernambucensis* Lemaire, Cact. Gen. Nov. Sp. 58. 1839. 



tCereus tetragonus minor Salm-Dyck, Hort. Dyck. 337. 1834. 

 Cereus formosus Forster, Handb. Cact. 404. 1846. 



Plant various in habit, often growing in clumps and then sometimes 4 to 5 meters broad, creep- 

 ing and sprawling, usually 2 to 4 dm. high, perhaps much higher; branches usually short, with 3, 

 4, or 5 ribs, pale green, sometimes nearly white; ribs prominent, often strongly crenate and very 

 thick; areoles large, 1.5 to 2 cm. apart, at first brown-woolly, afterwards with short white wool; 

 intervals between ribs of young shoots acute, deep, but on old shoots broad and shallow; spines 4 



*Originally, but erroneously, spelled Cereus fernambucensis. 



