T. Holm — Studies in the Cyperacece. 489 



rediscovered. Mr. N. B. Sanson found the plant on Bundle 

 Mountain near Banff in Alberta, at an elevation of 6,000 feet, 

 and growing together with Car ex rujpestris All. Through the 

 kindness of Mr. James M. Macoiin the writer has received an 

 excellent suite of fully matured specimens, in which we have 

 observed some characters which are not mentioned by Dewey; 

 we remember that the material which Dewey described was 

 not quite mature and only scantily represented. 



One of the most striking peculiarities in this species is the 

 manner in which the staminate and pistillate flowers are dis- 

 tributed. The number of spikes varies from two to five, but 

 four seems to be the most frequent. As indicated in the diag- 

 nosis " spica terminali androgyna superne staminifera" Dewey 

 did observe that both sexes were present in the terminal spike ; 

 however he makes no mention of the other spikes, which he 

 evidently took to be pistillate, as is the most frequent in this 

 group of Carices. While thus an androgynous terminal spike 

 appears to be typical of this species, it deserves notice that 

 this spike is wholly staminate in small specimens. In regard 

 to the other spikes the distribution of the sexes varies some- 

 what, and may be illustrated by the following table : 



Terminal spike : mostly audrogynous, seldom purely 



staminate. 

 Uppermost lateral spike : staminate, very seldom pistillate. 

 Second lateral spike : pistillate or androgynous, very 



seldom staminate. 

 Third lateral spike : pistillate, very seldom androgynous. 

 Fourth lateral spike : pistillate, very seldom androgynous. 



There is thus a tendency of having the staminate flowers 

 situated in a single spike below the androgynous terminal, 

 while the subsequent spikes are mostly pistillate or, sometimes, 

 androgynous. Such irregularities in regard to the disposition 

 of the flowers are not, however, uncommon in various greges 

 of the genus. 



To the original diagnosis may, furthermore, be added that 

 the perigynium (fig. 4) is hairy above and distinctly nerved 

 (six or seven nerves on the outer face) when mature ; the 

 orifice is whitish, slit on the outer face, but entire on the 

 inner. When fully mature the perigynium is longer than 

 the scale. As may be seen from the accompanying drawing 

 (tig. 1) the rhizome is stoloniferous, and the slender culms 

 are longer than the leaves ; the basal spike is long-peduncled 

 and drooping, while the others are sessile and appressed to the 

 culm. 



The internal structure, which agrees with that of several of 

 the other mountain species, may be briefly described as follows : 



