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south of lat. 36°, and the country of the Gila, its large southern trib¬ 
utary. This has thus far furnished thirty-six Cactacese, viz.: -— 
Five Mamillarice , 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- 
topuntice , 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 
Mamillarice and a “ Melocactus ” (?), which latter he has not seen 
himself, nor are there any known specimens in existence. 
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