Mackenzie : Notes on Carex 481 



have been referred to Carex f estiva Dewey, and must be kept 

 distinct if any effort at all is made to understand the closely re- 

 lated species of this group. It is most closely related to Carex 

 ebenca Rydb., but usually may be quickly distinguished as follows : 



Perigynia narrowly to broadly ovate, their beaks spreading C. nubicoia. 



Perigynia lanceolate, their beaks generally appressed C. ebenea. 



The large perigynia, very dark-appearing heads, and generally 

 low height separate it from Carex f estiva itself. 



The following specimens have been examined : 



Colorado: High mountains about Empire, \2,ooo it. ^ Patter - 

 S071 2gi, Sept. 6, 1892 ; Pagosa Peak, 12,000 ft, Baker 2j2, 



Wyoming : Buffalo Fork, 10,500 ft. to 10,800 ft, Tzveedy 42^, 

 435, Aug., 1897 ; Mt Leidy, 9,000 ft., Tzveedy 407, Aug., 1897 ; 

 Dunraven Peak, A. & E. Nelson 66g2, Aug, 27, 1899; Head- 

 waters Cliff Creek 9,000 ft, C. C. Ctirtis^ Aug, 9-18, 1900. 



Montana : Electric Peak, 10,000 ft, Rydberg & Bessey 3811, 

 Aug. 18, 1897; Long Baldy, Little Belt Mts., jfioo-%,000 ft., 

 Flodman J04, Aug. 19, 1896. 



i/ Carex Holmiana sp. nov. 



Culms slender, 4—7 dm. high, phyllopodic, much exceeding 

 the leaves, roughened above on the sharp angles, reddened and 

 somewhat filamentose at base. Leaves with well-developed blades 

 five to ten to a fertile culm, clustered near the base, the blades flat 

 with somewhat re volute margins, 2-3.5 "^^- wide, usually 1-3 

 dm. long, somewhat roughened towards apex ; inflorescence con- 

 sisting of three or four strictly erect, oblong-cylindric^ approximate 

 or slightly separate spikes, 16-30 mm. long, 7-10 mm. wide, the 

 lateral pistillate, short-peduncled or nearly sessile and with 30-50 

 ascending perigynia closely packed in several or many ranks, the 

 terminal similar, short-peduncled, but the lower fourth or third 

 staminate ; lowest bract leaflet-like, shorter than the inflorescence 

 or exceeding it, auricled at base, the upper bracts reduced; scales 

 ovate or ovate-lanceolate, abruptly more or less strongly cuspi- 

 date, brown with conspicuous lighter center and narrowly hyaline 

 margins, the pistillate about as wide as and exceeding perigynia ; 

 perigynia oval, much flattened except where distended by ripen- 

 ing achene, 4 mm. long, 2 mm. wide, not darkened, finely many- 

 nerved, rounded at base and apex, and beakless, the orifice entire; 

 achenes triangular, obovoid, 2.2 mm. long, 1.2 mm. wide, sessile, 

 dark-colored ; stigmas three. 



