187 
reached mainly from a more complete knowledge of flowers and 
fruits. Dr. Engelmann in his Synopsis of the Cactaceae of the 
United States (Proc. Amer. Acad. 3: 260-346. 1856) had 
earlier indicated some subgenera and had recognized Cereus gi- 
ganteus as belonging to one of these, which he called Lepido- 
cereus, a name which it is neither necessary nor desirable to main- 
Fic. 32. Cluster of flowers at apex of stem of Carnegiea gigantea growing near 
ucson, Arizona. 
tain; he also included in this subgenus C. Thurberi Engelm., 
native of Sonora and Arizona, which we now know should be 
excluded, leaving only the sahuaro in the genus which we here 
propose under the name 
CARNEGIEA. 
A day-blooming cactus, with stout upright stems and few 
branches, or none, strongly ribbed, the areoles velvety, close 
together, and bearing 12-18 spines. Flowers borne at the are- 
oles near the top of the stem and branches, funnelform, the tube 
