194 



THE C ACT ACE A3. 



HYLOCEREUS sp. 



Dr. J. A. Samuels collected a species of this genus in the forest plantation, La Poule, 

 Surinam, April 24, 1916 (No. 305), which is the first record we have of this genus being 

 found in Dutch Guiana. Dr. Samuels's plants are juvenile ones, at least in part, as the 

 spines on some specimens are represented by 10 to 12 spiny bristles at each areole; other 

 branches which are more mature are less than 2 cm. broad, 3-angled, with the areoles only 

 1 to 1.5 cm. apart; the margin of the rib is almost straight; spines 3 to 5, brown, 2 to 3 mm. 

 long. The specimens are without flowers or fruit. While reading the last proof, specimens 

 have been received from Gerold Stahel, of Paramaribo, Surinam, which lead us to believe 

 that the plant from that country is Hylocereus lemairei. Here probably belongs the plant 

 from Surinam which Linnaeus called Cactus triangularis (Amoen. Acad. 8: 257. 1785). 



Fig. 270. — Hylocereus antiguensis. 



Fig. 271. — Joint of H. 

 calcaratus. X0.5 



Hylocereus sp. 



A species, apparently of this genus. It is a long, clambering plant running over and 

 through tops of shrubs and trees and sometimes killing them, with strongly 3-angled 

 joints, the margins of the ribs rather thick, hardly undulate; the areoles 5 to 6 cm. apart, 

 with 6 to 8 subulate spines, the longer 12 to 15 cm. long. It was collected by E. A. Gold- 

 man at Carrizal, Vera Cruz, May 25, 1901 (No. 697). Its flowers and fruit are unknown. 



Hylocereus sp. 



Branches slender, 3-angled, or sometimes nearly terete, 2 to 3 cm. broad, dull green, sometimes 

 perhaps glaucous ; margin not horny ; areoles often distant, sometimes 5 cm. apart, borne on prominent 

 and more or less reflexed knobs ; spines brown, 2 to 4, stout, conic. 



Collected by Dr. Rose near Puerto Cabello, Venezuela, in 191 6 (No. 21870). 



