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 12 to 15, rather thin, acutish; 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: pl. 15, as Melocactus sp. 
Figure 248 is from a photograph of the type plant. 
Fic. 248.—Cactus zehntneri. Fic. 249.—Cactus sp. 3 
18. Cactus neryi (Schumann). Cacrus OQXxQCENSIS. 
Melocactus neryi Schumann, Monatsschr. Kakteenk. 11: 168. 19O!. 
More or less depressed, 10 to 11 cm. high, 13 to 14 cm. in diameter, crowned by a small cephalium 
a little broader than high; ribs 10, broad and low; radi i i 
; , bi ; radial spines 7 to 9, terete, spreading outward, 
2.5 cm. long; flowers 2.2 cm. long; stigma-lobes greenish; fruit clavate. red. P ° 
Type locality: Aracé-Fluss, Brazil. 
Distribution: State of Amazonas, Brazil. 
ae plant is known to us only from description and illustrations. 
lant le specific name for this plant was originally spelled negryi instead of neryi. The 
plan was named for Herr Nery, at one time Governor of Amazonas, Brazil. Schumann 
esr es the species and cites himself as the author of the name in the original place of 
pu ication inte " his Keys of the Monograph he credits the name to Witt 
ustrations: Monatsschr. Kakteenk. 11: 169: Schu 
130. f. 32, as Melocactus neryt. ? mann, Gesamtb. Kakteen Nacht 
Figure 250 is a reproduction of the original i i i 
. d > original illustration cited abov 
CacTUS sp. * Coc4s/5 ORNACEIIS US aan 
>) 1 b 
Plant small, globose, 1 dm. in diameter; ribs about 11 to 13, rounded, low; spines usually 10 
to 12, subulate, more or les r : 
, s recurved; central spine ; imes 2° =n di . 
flowers small; fruit small. P 1 or sometimes 2; crown 10 to 12 cm. in diameter, 
We know this only from a barren plant but it is evidently of this genus. 
