236 



THE CACTACEAE. 



Plate xxiv, figure 5, shows a plant collected by Rose and Russell at Cabo Frio, August 

 8, 1915 (No. 20698). Figure 238 is reproduced from the first illustration cited above. 



17. Cactus zehntneri sp. nov. 



Often cylindric, sometimes 2 to 3 dm. high ; ribs 1 2 to 1 5 , rather thin, aeutish ; radial spines terete, 

 stout, dark brown, more or less incurved, 2.5 cm. long or less; central spine one, similar to the radials, 

 erect or ascending; flowers pinkish; fruit red. 



Very common on the flats near Joazeiro, Bahia, where it was collected by Dr. Rose and 

 P. G. Russell in 1915 (No. 19728). 



These plants grow in the open on the flats in the semiarid part of Bahia, often associated 

 with Cephalocereus gounellei and other cacti. 



Illustration: Vegetationsbilder 6: pi. 15, as Melocactus sp. 



Figure 248 is from a photograph of the type plant. 



Fig. 248. Cactus zehntneri. Fig. 249. Cactus sp. 



18. Cactus neryi (Schumann). 



Melocactus neryi Schumann, Monatsschr. Kakteenk. 11: 168. 1901. 

 More or less depressed, 10 to 1 1 cm. high, 13 to 14 cm. in diameter, crowned by a small cephalium 

 a little broader than high; ribs 10, broad and low; radial spines 7 to 9, terete, spreading outward, 

 2.5 cm. long; flowers 2.2 cm. long; stigmadobes greenish; fruit clavate, red. 



Type locality: Araca-Fluss, Brazil. 



Distribution: State of Amazonas, Brazil. 



The plant is known to us only from description and illustrations. 



The specific name for this plant was originally spelled ncgryi instead of neryi. The 

 plant was named for Herr Nery, at one time Governor of Amazonas, Brazil. Schumann 

 describes the species and cites himself as the author of the name in the original place of 

 publication while in his Keys of the Monograph he credits the name to Witt. 



Illustrations: Monatsschr. Kakteenk. n: 169; Schumann, Gesamtb. Kakteen Nachtr. 

 130. f. 32, as Melocactus neryi. 



Figure 250 is a reproduction of the original illustration cited above. 

 Cactus sp. 



Plant small, globose, 1 dm. in diameter; ribs about 11 to 13, rounded, low; spines usually 10 

 to 12, subulate, more or less recurved; central spine 1 or sometimes 2 ; crown 10 to 12 cm. in diameter; 

 flowers small; fruit small. 



We know this only from a barren plant but it is evidently of this genus. 



