380 CYPERACE.E. (SEDGE FAMILY.) 



perigynium ovate-oblong, many-nerved, turgid, green at maturity. GRACIL- 

 LIM.E, Carey. 



25. C. Davisii, Schw. and Torr. Culm leafy, lax, 1 to 2 feet high: 

 leaves wide and flat, pale, more or less hairy : pistillate spikes about three, 

 usually an inch or more long and two or three lines broad : perigynium large 

 and turgid, prominently 12 to 15-nerved, gradually narrowed into a short and 

 stout slightly 2-toothed beak, about the length of the pale awned scale. 

 C. Torreyana, Dew. Moist grassy places, Indian Territory ( Geo. D. Butler) 

 and northward. 



* # Terminal spike all staminate : pistillate spikes in our species very narrow and 



slender and long-exserted and nodding, loosely flowered : perigynium small, 

 not inflated. DEBILES, Carey. 



26. C. arctata, Boott. Slender, 1 to 2 feet high : culm leaves short (2 to 

 4 inches) and broad ; radical leaves mostly short and spreading, all smooth : 

 pistillate spikes long-linear, 1 to 3 inches long and a line wide, all nodding at 

 maturity, very loosely flowered towards the base : perigynium small, some- 

 what 3-angled, prominently about 2 or 3-nerved, pointed, rather longer than 

 the acute, white scale. Along the Missouri at Fort Pierre (Dewey). 



* * * Terminal spike all staminate: pistillate spikes oblong, club-shaped or cy- 



lindrical (very small in No. 27), less drooping: perigynium few-nerved or 

 nerveless, tawny or whitish. FLEXILES, Tuckm. 



27. C. capillaris, L. Usually densely cespitose : culms very slender, vary- 

 ing from an inch to 15 inches (var. elongata, Olney) in height, much longer than 

 the numerous very narrow radical leaves: pistillate spikes 1 to 4, loosely 3 to 10- 

 flowered, long-exserted and nodding, the lower often very remote : perigynium 

 small, ovate or ovate-oblong, contracted into a nearlij entire beak of about half its 

 length, about the length or longer than the white or tawny hyaline scale. High 

 mountains from Colorado westward and northward. A delicate species, vari- 

 able in size and in the length and shape of the pistillate scales. (Eu.) 



28. C. frigida, All. Stoloniferous : culm slender, 1 to 1| feet high, much 

 longer than the short and rather broad many-nerved, lax radical leaves: bracts 

 conspicuously and loosely sheathing, the lower more or less leaf-like, the upper 

 setaceous : pistillate spikes ferruginous, nearly or quite an inch long, the lower 

 club-shaped and long-exserted, the upper more or less cylindrical and often sessile 

 or nearly so and approximate: perigijnium lanceolate, slightly inflated, flattened, 

 at first wholly or partly green, at length becoming more or less ferruginous, 

 obscurely nerved, hairy on the angles, tapering and 2-toothed, longer than the 

 acute dark-brown scale. Cottonwood Lake, Utah (Sereno Watson); also in 

 Oregon. (Eu.) (See Addendum.) 



29. C. longirostris, Torr., var. minor, Boott. Cespitose : culm rather 

 strong, 6 to 8 inches high, obtusely angled, rather longer than the flat and 

 soft leaves: pistillate spikes 2 to 3, greenish-white, short (^ inch long), thick, 

 nearly erect: perigynium large, 2-nerved, green and shining, produced into a 

 slender ivhite-tipped toothed beak of half or more its length : scale white, acute 

 or cuspidate, about the length of the perigyninm. Colorado (Hall $* Har- 

 bour). The species, differing in its much greater size, longer and at length 

 long-pendulous spikes, and very long-beaked perigynium, occurs near the 

 boundary in British America. 



