CYPERACEAE. 21 J 



Lab. and Greenland to Br. Col. , south in the Rocky Mts. to Colo. Also in northern 

 Europe and Asia. Summer. 



140. Carex supina Willd. Weak Arctic Sedge. (I. F. f. 810.) Glabrous, 

 tufted ; culms nearly filiform, sharply 3-angled, 1-2.5 dm. tall. Leaves about 

 I mm. wide, rough-margined, flat, shorter than the culm ; lower bract short, subu- 

 late ; staminate spike sessile or nearly so, 6-12 mm. long ; pistillate spikes 1-3, 

 sessile near the summit, subglobose or oblong, 4-6 mm. long ; perigynia ovoid, 

 smooth, hard, nerveless, about 2 mm. long, 3-angled, with a very short beak ; 

 scales ovate, brown-purple or lighter-margined. N. Minn, (according to Bailey) 

 and Manitoba to arctic America and Greenland. Also in northern Europe and 

 Asia. Summer. 



141. Carex leptaleaWahl. Bristle-stalked Sedge. (I. F. f. 811.) Light 

 green and glabrous ; culms filiform, smooth, 1.5-4.5 dm. long. Leaves not over 

 0.5 mm. wide; spike solitary, terminal, androgynous, linear, 4-14 mm. long; 

 perigynia few, linear-oblcng, light green, many-nerved, obtuse and beakless, about 

 3 mm. long; scales membranous, the lowest sometimes attenuated into a subulate 

 awn nearly as longas the spike ; stigmas 2 or 3. In bogs and swamps, Newf. to Br. 

 Col., Fla., La., Tex., Colo, and Ore. June-Aug. 



142. Carex filifolia Nutt. Thread-leaved Sedge. (I. F. f. 812.) Densely 

 tufted, pale green and glabrous; culms slender, smooth, erect, 0.7-3.5 dm. tail. 

 Leaves filiform, rather stiff, about 0.5 mm. wide, their sheaths ultimately fibrillose; 

 spike erect, bractless, 0.6-3 cm - l° n £> the pistillate part about 4 mm. in diameter; 

 perigynia obovoid-oval, triangular, few-nerved or nearly nerveless, rough or some- 

 what pubescent at the summit, 2 mm. long, abruptly tipped by a short cylindric 

 entire beak; scales broadly oval, about as long as the perigynia but much broader. 

 In dry soil, Manitoba to Br. Col. , Kans. , Colo, and Cal. May-July. 



Perigynia nerveless, or faintly few-nerved. 



Perigynia with a short nearly entire beak. 143. C. capitata. 



Perigynia beakless, the orifice 2-toothed. 144. C. nardina. 



Perigynia strongly several-nerved on the outer face. 



Beak of the perigynium very short. 145. C. Redowskyana. 



Beak slender, rough, about half as long as the body of the perigynium. 



146. C. exilis. 



143. Carex capitata L. Capitate Sedge. (I. F. f. 813.) Culms very 

 slender, stiff, 0.5-4.5 dm. tall, smooth or nearly so. Leaves filiform, involute, 

 erect, shorter than the culm; spike ovoid, bractless, 4-8 mm. high; perigynia 

 oblong-elliptic, 2 mm. long, 1 mm. thick, with a nearly entire dark brown beak 

 about one-fourth as long as the body ; scales broadly ovate, brown, shorter and 

 rather broader than the perigynia. Greenland and Lab. to the N. W. Terr, and on 

 the White Mts. Also in Europe. Summer. 



144. Carex nardina Fries. Nard Sedge. (I. F. f. 814.) Culms filiform, 

 smooth, 4-12 cm. tall, densely tufted. Leaves filiform, erect, about as long as the 

 culms; spike terminal, ovoid-oblong, 6-12 mm. long, bractless; perigynia oblong- 

 elliptic, yellowish brown, nerveless, nearly 4 mm. long, somewhat hispid above, 

 beakless, the orifice 2-toothed; scales ovate, brown, rather longer than the per- 

 igynia. Lab. and Hudson Bay to Br. Col. Summer. 



145. Carex Redowskyana C. A. Meyer. Redowsky's Sedge. (I. F. f. 

 815.) Culms slender, stiff. 0.7-2 dm. tall. Leaves almost bristle-form, erect; 

 spike oblong, 4-16 mm. long, the pistillate part 4-6 mm. thick, sometimes wholly 

 staminate or pistillate; perigynia ovoid-ellipsoid, stipitate, 2-3 mm. long, spread- 

 ing or reflexed when mature, strongly several-nerved, little compressed, rough above, 

 narrowed into a very short 2-toothed beak; scales ovate, acute or cuspidate, 

 shorter than or equalling the perigynia. In bogs, Lab. to the N. W. Terr., Me., 

 Vt., Penn., Mich, and in the Rocky Mts. to Colo. Also in Europe and Asia. 

 Summer. 



146. Carex exilis Dewey. Coast Sedge. (I. F. f. 816.) Culms very 

 tslender, stiff, nearly or quite smooth, 2.5-5 dm. ^ a ^' Leaves involute-filiform; 

 spike bractless, 0.6-3.6 cm. long, occasionally quite dioecious; perigynia ovoid- 

 ellipsoid, about 3 mm. long, rather strongly several-nerved on the outer face, 

 faintly few-nerved on the inner, spreading or reflexed at maturity, narrowed into a 

 slender rough 2-toothed beak, about one-half as long as the body; scales ovate. 



