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REVISION OF THE GENUS CEREUS MILL. 



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2. Decalophi Salm. 



Cereus (Echinocereus) acifer Otto. 1. c. 286, — Mexico. 



C. (Echinocereus) conglomerates (Forst.) A. Berg. 1. c. 278. 



Mexico. 

 0. ( Echinocereus) dubius Engelm. 1. c. 276. — Texas, Mexico. 

 C. (Echinocereus) Engelmannii Parry. 1. c. 275. — Southwest U. S. 

 C. (Echinocereus) Fendleri Engelm. 1. c. 274. — New Mexico, Souora, 



Arizona, etc. 

 C. (Echinocereus) Leeanus Hook. 1. c. 287. — Mexico. 

 C (Echinocereus) maritimus Jones. 1. c. 273. — California. 

 C. (Echinocereus) Merkeri (Hildm.) A. Berg. 1. c. 277. — Mexico. 

 C. (Echinocereus) mojavensis Engelm. & Bgl. 1. c. 279. — New 



Mexico, Arizona, California. 

 C. (Echinocereus) paucispinus Engelm. 1. c. 280. — Texas, New 



Mexico, etc. 

 C. (Echinocereus) phoeniceus Engelm. 1. c. 282. — Colorado, New 



Mexico, Arizona, Sonora, etc. 

 C. (Echinocereus) polyacanthus Engelm. 1. c. 285. — Mexico, Texas, 



California, etc. 

 C. (Echinocereus) Iioemeri Engelm. 1. c. 284. — Texas, New Mexico, 



Utah. 

 C. (Echinocereus) stramineus Engelm. 1. c. 273. — Mexico, Texas, 



Arizona, etc. 



There is no reason to keep Echinocereus as a distinct 

 genus, unless one accepts as genera the other subgenera 



as 



well. 



o 



elniann, Kew Index, Coulter and Weber 



report it as a subgenus only. 



The position of Cereus Emoryi Engelm. (Echi 



E 



remains still doubtful. I have not yet 



seen a flower of it. 



XVII. CLEISTOCACTUS Lem. in Illustr. Hort. 8. 



(1861). Misc. 35. (as genus). 



Flowers short and narrowly tubular, curved in the shape of an ^x*, and 

 the limb somewhat zygomorphic; ovary subglobose, like the tube with 

 numerous small appressed scales* bearing woolly hairs in their axils; 

 sepaloid and petaloid perianth leaves small, lanceolate, hardly expanded; 

 filaments inserted below the middle of the tube, somewhat exserted 

 and grouped together near the upper lip; style little longer. Fruit 



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