THE CACTACEAE. 



30. Cephalocereus chrysacanthus (Weber) Britton and Rose, Contr. U. S. Nat. Herb. 12: 416. 1909. 



Pilocereus chrysacanthus Weber in Schumann, Gesamtb. Kakteen 178. 1897. 

 Cereus chrysacanthus Orcutt, West Amer. Sci. 13: 63. 1902. 



Plant 3 to 5 meters high, branching near the base; branches erect or ascending, glaucous; ribs 

 about 12; areoles about 1 cm. apart; spines 12 to 15, the longer ones 3 to 4 cm. long, at first golden 

 yellow/ becoming darker in age ; flowers borne in definite zones on one side of the branch, accom- 

 panied by dense masses of long white hairs, nocturnal, 7 to 8 cm. long, rose-red; fruit smooth, reddish 

 or purplish, about 3 cm. in diameter, the flesh red; seeds black. 



Type locality: Near Tehuacan, Mexico. 



Distribution: Puebla and Oaxaca, Mexico. 



Illustration : MacDougal, Bot. N. Amer. Des. pi. 1 7, in part, as Pilocereus chrysacanthus; 

 Mollers Deutsche Gart. Zeit. 29: 356. f. 12. 



Plate vii, figure 2, is from a photograph taken by Dr. MacDougal near Esperanza, 

 Mexico, in 1906. 



31. Cephalocereus maxonii Rose, Contr. U. S. Nat. Herb. 12: 417. 1909. 



Cereus maxonii Vaupel, Monatsschr. Kakteenk. 23: 23. 1913. 

 Plant 2 to 3 meters high, with few long branches, erect or nearly so, in mature plants the tops 

 of the branches for about 30 cm. clothed with white hairs 4 to 5 cm. long; ribs 6 to 8, acute, pale 

 blue and somewhat glaucous; areoles small; spines about 10, slender, yellow, the central single, 4 

 cm. long, all nearly hidden in flowering areoles by the long white hairs; flowers purple, 4 cm. long; 

 ovary naked except for a few small scales; fruit 3.5 cm. broad, broader than high; seeds brownish, 

 reticulate, with an oblique basal hilum. 



Fig. 71. — Cephalocereus maxonii 



Fig. 72. — Cephalocereus piauhyensis. 



Type locality: Near El Rancho, Guatemala. 

 Distribution: Guatemala. 



This species, although discovered only a few years ago, has been repeatedly collected 

 since and is now to be found in living collections. It is called organo in Guatemala. 



