34 



THE CACTACEAE. 



linear, cream-colored, erect; stamens numerous, included; ovary naked or nearly so, oblong, 

 olive-green; fruit crowned by the persisting style, salmon-colored, about 6 cm. long, when fully 

 mature splitting from top to bottom, exposing the white juicy pulp. 



Type locality: La Guayra, Venezuela. 



Distribution: Northern Venezuela and Colombia. 



Collected by Dr. and Mrs. J. N. Rose in 191 5, on the mountains between La Guayra 

 and Caracas (No. 21828) and again near Puerto Cabello, Venezuela (No. 21859). 



This species was also collected by William R. Maxon in April 1906, at Puerto Colombia, 

 Colombia, and in June of the same year at the same place by H. Pittier, and by John G. 

 Sinclair in 1914, at Santa Marta, Colombia. Mr. Maxon's plant was confused with Cephalo- 

 cereus colombianus, based on material collected by Mr. Pittier from the State of Cauca. 



Illustration: Mollers Deutsche Gart. Zeit. 25: 473. f. 5, No. 5, as Pilocereus russelianus. 



Figure 38 is from a photograph taken by Mrs. J. N. Rose above Caracas, Venezuela, 

 in 1916; figure 39 is from a photograph of the top of a plant collected by J. G. Sinclair 

 at Santa Marta; figure 36 shows the flower of the Caracas plant and figure 37 its fruit. 



Fig. 38. — Cephalocereus russelianus. 



Fig. 39. — Cephalocereus russelianus 



1897- 



11. Cephalocereus gounellei (Weber). 



Pilocereus gounellei Weber in Schumann, Gesamtb. Kakteen 188. 



Cereus setosus Giirke in Ule, Monatsschr. Kakteenk. 18: 19. 1908. Not Loddiges. 1832. 



Pilocereus setosus Giirke, Monatsschr. Kakteenk. 18: 52. 1908. 



Low, 1 to 2 or rarely 3 meters high, much branched and spreading to as much as 5 meters in 

 diameter, often with a definite woody trunk up to 1 2 cm. in diameter ; lower branches at first spread- 

 ing or creeping, the tips ascending or even erect, pointed, the upper branches horizontal; ribs 10 

 or n, stout, acute, more or less tuberculate; areoles large, 1.5 cm. in diameter; flowering areoles 

 with many long white hairs covering the flower-buds; radial spines 15 to 24, widely spreading, 

 brown; central spines 4 to 6, subulate, much stronger than the radials, sometimes 10 cm. long; 

 perianth tubular to funnelform, white, 7 to 9 cm. long, glabrous, the limb shorter than the tube; 

 stigma-lobes 15 to 18; ovary glabrous ; fruit purplish, depressed-globose. 



