472 PHANEROGAMOUS PLANTS. 



2. Cyperus aristatus, Rottb. 



Cyperus aristatus, Rottb. Gram. t. 6,11; Kunth, Enum. 2, p. 23 ; Steudel, Cyp. 



p. 14; Benth. PI. Hartw. p. 341 ; Torr. Bot. Mex. Bound, p. 227. 

 C. infiexus, Muhl. Gram. p. 16 ; Torr. Fl. M. & N. States, p. 59 ; & Cyp. 1. c. p. 273 ; 



Hook. Fl. Bor.-Amer. 2, p. 232 ; Steud. Cyp. 1. c. 

 C. uncinatus, Pursh, Fl. 1, p. 50, non Poir. 

 C. pygmwus, Nutt. in Amer. Phil. Trans, n. ser. 5, p. 142 ; non Cav. nee Rottb. 



Hab. On the Walla- Walla River, Washington Territory. — After a 

 careful re-examination of this plant, and comparing specimens from 

 many parts of North America with G aristatus, I could find no 

 sufficient character for distinguishing them. It is probable that 

 several other species of the section Aristati, in Steudel's Synopsis, 

 should be reduced to this. 



3. Ctperus virens, Michx. 



Cyperus vegetus, Michx. Fl. 1, p. 28; Muhl. Gram. p. 24; Torr. Cyp. 1. c. p. 275; 

 Steud. Cyp. 



Hab. Valley of the Sacramento, California. — The solitary speci- 

 men in the collection accords with some of our numerous forms of 

 this species. Perhaps all of them should be referred to G. vegetus 

 Willd. 



4. Cyperus Sohweinitzii, Torr. 



Cyperus Schweinitzii, Torr. Cyp. 1. c., & FL N. York 2, p. 243 ; & Bot. Mex. Bound. 



p. 267 ; Steud. Cyp. p. 19. 

 C. Houghtonii, Torr. 1. c. ; Steud. 1. c. 

 C. alter niflorus, Schwein. in Long's 2d Exped. 2, p. 381, non R. Br. 



Hab. On the Kooskooskee River, Washington Territory. — The 

 specimens in this collection confirm the opinion expressed in the 

 Botany of the Mexican Boundary Survey, that Gyperus Houghtonii is 

 not distinct from G. Schiveinitzii. 



