THE CACTACEAE. 



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

 al><mt tlir laltt-r place, where it is the most common cactus seen, being abundant 

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

 \ inrs, and biumcliads. 



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

 K.cky hillsides and cliffs, and varying from slender, light green, and simple-stemmed in 

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



us pfeifferi Parmentier (Pfeiffer, 

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

 -ynonymy of ( 'ereus nu-it:ia>nisby Labouret 

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

 on the same page that in Monville's Cat- 

 alogue is indicated the variety C. moritzianns 



feri. As ('crcits pfcijjcri is supposed to 

 have originally come from Buenos Aires, it is 

 more likelv to be a true 



I'ic.- vi. Flower of Cephalocertnis moritziamis. 

 Kii.. IJK.- -Fruit uf suine. Both Xo.7. 



FIG. 61. Cephalocereus moritzianns. 



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 U'ariinii Schumann in Martins, Fl. Bras. 4': 204. 1890. 

 Pilocereus exerens Schumann in Engler and Prantl. Pflanzenfam. 3 6 a; 181. 

 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 

 ( 'crcits cxcrcns, an unpublished name of Link. Pilocereus arrabiJac 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. 



