Dr. Engelmann on the wei giganteus of Cana e 5 
0. O. Ramosissma, n. sp. : cate erecto ligneo dhivarient ee 
osissimo ; articulis Seats cylindricis tuberculatis Cesiis ; 
- aculeis subsolitariis saccato-vaginatis; bacca sicca tuberculata se- 
tosa et aculeata. 
__ Gravelly soil near the Colorado, and in the desert. Plant two 
feet high; the joints half an inch in diameter. Approaches the 
Soe cylindracee graciliores. 
¥I, n. sp.: caule prostrato; articulis adscendenti- 
_ bus sna setis fuscis; aculeis brevibus albidis, singulo 
_ longiore deflexo ; bacca subelobosa setoso-aculeata. 
A Eouattn slope of the Califoraia mountains, near San Felipe. 
Joints four to eight inches long; the longest spines half an inch 
long. Flower one and a half inch in diameter, yellowish-green. 
Approaches the Opuntie clavate. 
_ Mr. Charles Wright, well known to the botanical world by his 
‘collections made in the southwest, now also attached to the Mex- 
_ iean boundary commission, has, under the instruction of Col. 
Graham, made large and interesting collections of Cacti in west- 
ern n Texas and southern New Mexico, and sent them to me for 
_ examination 
= is impossible here to give as full an account of them as 
— would. be desirable; but most of them are now in cultivation 
= Most of the Cactacee di 
e copper oe and the lower Gila, appears to be rare every 
