314 PROCEEDINGS OF THE AMERICAN ACADEMY 



south of lat. 36°, and the country of the Gila, its large southern trib- 

 utary. This has thus far furnished thirty-six Cactacece, viz. : — 



Five McnnillaricE, three of them peculiar species ; 



Six Echinocacti, none of them found elsewhere ; 



Seven Cerei, representatives of each of our four subgenera, and five 

 of them peculiar ; 



Eighteen Opuntice, of which six (all peculiar) belong to the Pla- 

 topunticB, two to the clavate and ten to the cylindric Cylindropuntice ; 

 one of the former and nine of the latter peculiar. 



7. The Californian Region, namely, California west of the 

 Sierra Nevada, and comprising the southwestern part of the present 

 State of California, produces six Cactacece, five of which are peculiar. 

 They are, — 



One Mamillaria ; 

 One Echinocactus ; 



One Cereus of the section Eucereus ; and 



Three Opuntice ; one of them a Platopuntia, probably only a form 

 of a more eastern species, and two peculiar Cylindropuntice. 



8. The Northwestern Region, comprising the northern parts of 

 the State of California, the Territories of Utah, Oregon, and Wash- 

 ington. This region has so far furnished only a single Opuntia (from 

 Eastern Oregon), common also to the Missouri Region. — Mr. Geyer, 

 in his account of his expedition to Oregon in 1843, mentions two 

 Mamillari(B and a " Mel o cactus'''' (?), which latter he has not seen 

 himself, nor are there any known specimens in existence. 



Corrections and Additions. 



P. 267. Mamillaria scolymoides has been collected by Mr. Wright, 



on the Pecos, in Western Texas. 



P. 273. 9th line from top, dele " 1 " after " fuscatis." 



P. 278. 5th line from top, for " parallelse " read " contrarise." 



P. 286. Cereus Berlandieri is very near C. pentalophus, DC, but 



Prince Salm, who has cultivated both side by side, considers them 



well distinguished. 



P. 300. Opuntia Missourieiisis has been sent from Clear Water, 



on the Kooskooskie, in Oregon, by the Rev. Mr. Spalding. 



