= 4 Z : Dr. Engelmann on the Cereus giganteus of —— is 
matibus 3; bacca coccinea pyriformi; seminibus nigris hilo spon- me) 
Aang fasco auctis 
From San Diego to the junction of the Gila with the Colorado. is 
—M. Groodrichii, Scheer, obtained on the island of Cerro on the 
coast ‘of California, is distinguished by the ave central spine 
only being hooked, by much smaller tubercles, : 
Ecuinocactus virrpescens, Nutt. Depr ee ; berry sub- 
globo ose green, coated with lunate membranaceous scales, On 
dry hills and ridges near San Diego. = 
3 RIDESCENS, §? CYLINDRACEUS, is distinguished by its — 
oval or cylindrical shape, larger size, longer spines. Found n 
San Felipe, on the eastern slope of the California mountains. 
Note.—E. Catirorsicus, Monv., is the name of young plants 
rom seed in Europe. I am informed that neither the 
identity nor the native country of these seedlings is satisfactorily Se 
ee ne 
4° Cerevs Enmoryt, n. sp.: caule prostrato ; ramis erectis cyl- 
indraceis ciate aculeis radialibus 40-50, centrali singulo 
robustiore porrecto ; baeca globosa spinulosa. 
In thick patches, on dry hills near the sea shore, about the 
boundary line. Erect branches 6—9 inches hi igh. 
5. C. Excetmannt, Parry in litt.: caulibus pluribus pedali- 
bus; costis 13 tuberculatis ; ; aculeis 4 centralibus ineequalibus ra- 
diales tenuiores superantibus : bacea ovali aculeata pul 
ee Mountains about San Felipe, on the eastern declivity of the 
es Cordilleras. 
- Wote-—C.? Carirorsicus, Nutt. in Torr. and Gray's Flora, 
is most probably a eylindraceous nae with “small yellow 
owers,” which I cannot now iden get 
ie 6. Opuntia Encetmannt, Salm n Diego, on dry hillsides, in 
Z patches, et * 6 feet high. Origitially discovered about Chihua- 
) hua, this species apple to extend westward to the Pacifie. es 
7. O. Tuna, Mill., is cultivated for fences, and naturalized _ 
about the eae called “Tuna.” It is 10-15 feet thigh; the 
frnit large and edi ble. : 
_8. O. protirema, n. sp.: caule erecto ligneo ; ramulis cylindri- 
cis Siac ies died: aculeis fuscis vaginatis; bacea spin- 
San Diego, on arid hill§ and in dry creek oe Plant Eas 
feet high, forming impenetrable thickets. Near O = 
oe Mexico ; but the red flowers smaller, the ae ay spinous, ete. 
O. SeRPENTINA, n. sp.: pro cumbens ; artienlis _cylindricis ee 
hen tuberenlatis : aculeis 7-9 Vaginatis; bacea sicca hemis- — 
» pherica aculeatissima. oe 
me: hillaiclee, aie siege 
