NEOMAMMILLARIA. 



139 



or blackish at tip; spine-areoles when young densely white- woolly; fruit clavate, red, 10 to 18 mm. 

 long; seeds black with basal hilum. 



Collected on Santa Cruz Island, Gulf of California, by J. N. Rose, April 16, 191 1 

 (No. 16842, type), and by Ivan M. Johnston in 1921 (No. 3912); also on the adjacent 

 island of San Diego by Mr. Johnston (No. 3923). 



This is a very beautiful plant which grows in small clusters and is covered with nearly 

 pure white spines. A number of plants were brought back to the New York Botanical 

 Garden in 191 1 by Dr. Rose but they have all since died. We now have living plants sent 

 in by Mr. Johnston from two localities. 



Figure 152 is from a photograph of a plant sent by Mr. Johnston to Washington from 

 the type locality. 



•*se^-^ -^ wi>"' '■•% A-—f' 



Fig 153. — Neomammillaria slevinii. 



103. Neomammillaria slevinii sp. nov. 



Plants simple, cylindric, i dm. high or more, 5 to 6 cm. in diameter, entirely hidden under the 

 many closely set spines; spines at top of plant pinkish below, with brown to blackish tips, on 

 lower part of plant bleaching white; radial spines numerous, acicular, widely spreading; central 

 spines about 6, a little longer and stouter than the radials, slightly spreading; flowers about 2 cm. 

 broad ; outer perianth-segments with a pinkish mid-rib ; inner perianth-segments white ; filaments 

 pinkish; style nearly white; stigma-lobes nearly white; fruit red, about i cm. long; seeds black, 

 nearly globular, with a projection at base and a large basal hilum. 



Collected by J. N. Rose, March 31, 191 1 (No. 16550, type), on San Josef Island, 

 and by Ivan M. Johnston in 192 1 (No. 3943) on San Francisco Island just off the south- 

 em end of San Josef Island. 



This species is related to Neomammillaria albicans, but it has darker spines and the 

 spine-areoles are not densely lanate. 



The plant is named for J. R. Slevin, who was in charge of the scientific expedition of the 

 California Academy of Sciences to the Gulf of California in 192 1, at which time the plant 

 was collected. 



