42 



the; cactaceae;. 



This species is common above La Guayra and about Puerto Cabello, Venezuela, 

 especially about the latter place, where it is the most common cactus seen, being abundant 

 both on the hills and on the flats near the sea. Its branches are often overrun by orchids, 

 vines, and bromeliads. 



It is abundant on Monos, Chacachacare, and Patos Islands of Trinidad, inhabiting 

 rocky hillsides and cliffs, and varying from slender, light green, and simple-stemmed in 

 sunny situations to stout, dark green, and much branched in woodlands. 



Cereus pfeijferi Parmentier (Pfeiffer, 

 Allg. Gartenz. 5: 370. 1837) is referred to the 

 synonymy of Cereus moritzianus by Labouret 

 (Monogr. Cact. 344. 1853), who also states 

 on the same page that in Monville's Cat- 

 alogue is indicated the variety C. moritzianus 

 pfeijferi. As Cereus pfeijferi is supposed to 

 have originally come from Buenos Aires, it is 

 more likely to be a true Cereus. 



Fig. 59. 

 Fig. 60.- 



-Flower of Cephalocereus moritzianus. 

 -Fruit of same. Both X0.7. 



Fig. 61. — Cephalocereus moritzianus. 



Figure 61 is from a photograph taken by Mrs. J. N. Rose near Puerto Cabello, Vene- 

 zuela, in 1916; figure 59 shows the flower of this plant; figure 60 a fruit of same. 



22. Cephalocereus arrabidae (Lemaire). 



Pilocereus arrabidae Lemaire, Rev. Hort. 1862: 429. 1862. 

 Cereus warmingii Schumann in Martius, Fl. Bras. 4 2 : 204. 1890. 

 Pilocereus exerens Schumann in Engler and Prantl, Pflanzenfam. 3 6 a; 

 Cephalocereus exerens Rose, Stand. Cycl. Hort. Bailey 2: 715. 1914. 



1894. 



Rather low but sometimes 3 meters high, often much branched at base, usually pale, somewhat 

 glaucous; branches 6 to 10 cm. in diameter; ribs 6 to 8, high, obtuse; areoles rather close together, 

 producing long hairs when young, but no tufts of hairs or wool at flowering time; spines 5 to 10, 

 acicular to subulate, unequal, the longest up to 4 cm. long, brownish or sometimes yellowish; flowers 

 6 cm. long; inner perianth-segments white; fruit depressed, 6 cm. broad; seeds black, shining. 



Type locality: Not cited. 



Distribution: Along the sandy coast of Brazil. 



The synonymy of this coastal species of Brazil is very complicated, for it has been con- 

 fused with a Mexican species of uncertain relationship. An attempt is here made to account 

 for the various names. Schumann took up the specific name exerens for it, basing it on 

 Cereus exerens, an unpublished name of Link. Pilocereus arrabidae Lemaire seems to be 

 the oldest definite name for the plant. This is not to be confused with Cereus arrabidae 

 (Steudel, Nom. ed. 2. 1: 333. 1840) as it has been in the Index Kewensis. 



