254 BOTANICAL GAZETTE | SEPTEMBER 
groove absent in young plants, but extending to the axil of 
the floriferous tubercle: radial spines 8 to 11, teretish, bulbous 
at base, spreading, 15 to 20™” long, white or more or less tinted with 
purple, straight or slightly curved, lower spine and 1 to 3 slender 
upper ones a little farther back on tubercle than the remaining 7, 
which are very robust and form an almost perfect circle around the 
stout central ; central somewhat longer than radials and sometimes 
slightly flattened on upper side, always solitary and curved or hooked 
downward ; all with horny tips: flowers 5 to 6™ long and spreading 
to nearly same diameter, opening in bright sunshine and enduring for 
only a few hours, salmon-yellow: ovary tubular, 20 to a ee 
with from 4 to 7 minute, caducous scales - fruit and seeds unknow?” 
Type growing in cactus garden, University of Arizona. 
Description drawn from plant collected three years ago by H 
Brown, in the Baboquabari Mountains, in Southern Arizona, and 
now flowers for the first time, 
I have named this species for Mr. Herbert Brown, from whom o 
specreen was obtained. There has been some hesitation as tO ae 
this plant in the genus Mamillaria or Echinocactus. 
Mamiliaria macromeris and Echinocactus Simpsoni this plant a 
erbert 
which 
