332 



CYPERACEAE. 



120. Carex setifolia (Dewey) Britton. Bristle-leaved Sedge. (Fig. 790.) 



Carex alba var. setifolia Dewey. Am. Journ. Sci. ii: 316 



1826. 

 Carex eburnea Boott. ; Hook. Fl. Bor. Am. 2: 226. f>l. 225. 



1840. 



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

 4 / -i5 / long. Leaves filiform, shorter than the culm, 

 less than %" wide; bracts reduced to bladeless, 

 sheaths 2 // ~5 // long; starninate spikes solitary, ses- 

 sile or very nearly so, 3 // -4 // long; pistillate spikes 

 2-4, erect, slender-stalked, 2 // ~4 // long, rather less 

 than \" thick, loosely few-flowered, the upper com- 

 monly overtopping the staminate, the lower one 

 sometimes distant; perigynia oblong, pointed at 

 both ends, 3-augled, i // long, y^" 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 perigynia; stigmas 3. 



In dry sandy or rocky soil, preferring limestone rocks, New Brunswick to the Northwest Ter- 

 ritory, south to Pennsylvania, Kentucky and Nebraska. May-July. 



121. Carex concinna R. Br. Low North- 

 ern Sedge. (Fig. 791.) 



Carex concinna R. Br. Frank. Journ. 763. 1823. 



Culms filiform, smooth, 2 / -6 / tall. Leaves about 

 \' f wide, flat, pale green, much shorter than the 

 culm; bracts reduced to green bladeless sheaths or 

 the lower one with an erect subulate blade 3 // -6 // 

 long; staminate spike solitary, sessile; pistillate 

 spikes 1-3, sessile and clustered or the lower one 

 somewhat distant and short-stalked, erect, 2 // -4 // 

 long, about i" thick, compactly few-flowered; peri- 

 gynia oblong-ovoid, 3-angled, pubescent, short- 

 beaked, few-nerved, about twice as long as the ovate 



obtuse or subacute green or purplish scales; stigmas 3. 



I 



In rocky places, Quebec and Ontario to British Colum- 

 bia. Summer. 



122. Carex Richardson! R. Br. Richardson's Sedge. (Fig. 792.) 



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



Culms slender, rough, erect, 4 / -i2 / tall. Leaves 

 flat, about \" wide, the basal shorter than or some- 

 times equalling the culms, those of the culm very 

 short; bracts bladeless, sheathing, /4 / -i / long, usually 

 brown-purple with a white hyaline acute summit; 

 staminate spike solitary, short-stalked; pistillate 

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

 4"-9" long, compactly several-flowered, close to- 

 gether, their stalks partly or wholly enclosed in the 

 sheaths; perigynia obovoid, pubescent, about \" long, 

 minutely beaked; scales mostly longer than the peri- 

 gynia, ovate, obtuse or subacute, purple, conspicu- 

 ously white-margined; stigmas 3. 



In dry soil, Ontario to the Northwest Territory and 

 British Columbia, south to western New York, Illinois 

 Michigan and South Dakota. Summer. 



