39 6 



CYPERACEAE. 



Vol. I. 



107. Carex Richardsonii R. Br. Richardson's 

 Sedge. Fig. 974. 



Carex Richardsonii R. Br. Frankl. Journ. 751. 1823. 



Stoloniferous, the cultns slender, rough, erect, 4/-12' 

 tall. Leaves flat, about 1" wide, the basal shorter than 

 or sometimes equalling the culm, those of the culm 

 very short ; bracts bladeless, sheathing, i'-l' long, usu- 

 ally brown-purple with a white hyaline acute summit; 

 staminate spike solitary, stalked, 6"-i3" long; pistillate 

 spikes 1 or 2, erect, narrowly cylindric, short-stalked, 

 4"-io" long, compactly many-flowered, close together, 

 their stalks partly or wholly enclosed in the sheaths ; 

 perigynia obovoid, triangular, pubescent, about 1" long, 

 minutely beaked, obscurely nerved, mostly shorter than 

 the ovate, subacute, purple, conspicuously white-mar- 

 gined scales; stigmas 3. 



In dry soil, Ontario to Saskatchewan, Alberta and Brit- 

 ish Columbia, south to western New York, Illinois, Iowa 

 and South Dakota. Summer. 



108. Carex eburnea Boott. Bristle-leaved Sedge. Fig. 975. 



C. alba var. setifolia Dewey, Am. Journ. Sci. n : 316. 1826. 

 C. eburnea Boott ; Hook. Fl. Bor. Am. 2 : 226. pi. 225. 1840. 

 Carex setifolia Britton; Britton & Brown, 111. Fl. 1: 332. 

 1896. 



Glabrous, pale green, culms filiform, smooth, weak, 

 4-15' long, from slender, elongated rootstocks. Leaves 

 filiform, shorter than the culm, less than I" wide; 

 bracts reduced to bladeless sheaths 2"-$" long; stami- 

 nate spike solitary, sessile or very nearly so, 2"-4" 

 long; pistillate spikes 2-4, erect, slender-stalked, 2"-4" 

 long, rather less than 1" thick, loosely few-flowered, 

 the upper commonly overtopping the staminate, the 

 lower one sometimes distant; perigynia oblong, pointed 

 at both ends, 3-angled, 1" long, i" or less thick, polished 

 and nearly black when mature, very faintly few-nerved, 

 tapering into a short entire beak; scales ovate, obtuse 

 or the lower acute, thin, hyaline, shorter than the peri- 

 gynia; stigmas 3. 



In dry sandy or rocky soil, preferring limestone rocks, 

 New Brunswick to Alberta, south to Virginia, Tennessee, 

 Missouri and Nebraska. May-July. 



109. Carex Hassei Bailey. Hasse's Sedge. 

 Fig. 976. 



C. aurea var. celsa Bailey, Mem. Torr. Club 1 : 75- 



1889. 

 Carex Hassei Bailey, Bot. Gaz. 21 : 5. 1896. 

 C. bicolor Robinson & Fernald, in A. Gray, Manual, 



Ed. 7, 232. 1909. Not All. 



Similar to the following species, the culms 

 slender, usually 6"-2° long, from slender elon- 

 gated rootstocks. Leaves flat, i"-2" wide, gen- 

 erally shorter than culm; bracts similar to culm- 

 leaves, the lower exceeding spikes, sheathing, not 

 dark auricled ; terminal spike short-stalked, gynae- 

 candrous or frequently staminate ; pistillate spikes 

 2-5, linear-oblong, the upper aggregated and 

 sessile or short-stalked, the lower distant and 

 long-stalked, loosely or somewhat compactly 

 6-20-flowered, 2"-io" long, about il" thick; peri- 

 gynia ellipsoid or narrowly obovoid, whitish 

 pulverulent and not fleshy or translucent at ma- 

 turity, less than 1" in diameter, the nerves faint, 

 tapering at base, beakless, the orifice entire ; scales 

 as in the next, but more often dark-tinged; 

 stigmas 2. 



Labrador to north Maine, westward across the 

 continent and south in the mountains of California. June-Aug. 



