North American Cyperacea. 429 



Obs. This plant was incorrectly referred by R. Brown to 

 C. JUifolia of Nuttall, a species which has only been found on 

 the banks of the Missouri. Prof. Dewey, who mistook another 

 species for the C.filifolia of R. Brown, has recently described 

 the present plant under the name of Kohresia glohuluris. It 

 is somewhat strange that it should be placed in the latter genus, 

 since, although the perigynium is unusually thin and mem- 

 branaceous, the plant only differs from Carex in the presence 

 of a seta, which Prof. Dewey happened not to observe. As 

 the most accomplished botanists now include in Uncinia species 

 with a straight and an included seta, it seems advisable to re- 

 move this plant to that genus. 



