CYPERACEAE. 21 3 



bracts similar; terminal spike short-stalked, staminate or androgynous; pistillate 

 spikes 2-4, oblong, clustered near the summit or the lower one distant, filiform- 

 stalked, few-flowered, 4-20 mm. long; perigynia obovoid or subglobose, becoming 

 fleshy, yellow or brown and about 2 mm. in diameter when mature, many-nerved, 

 beakless, the orifice entire; scales ovate; stigmas mostly 2. In wet meadows, 

 springs and on wet rocks, New£ to the N. W. Terr, and Br. Col., south to Mass., 

 Perm., Mich., Utah and Wash. Summer. 



119. Carex bicolor All. Parti-colored Sedge. (I. F. f. 789.) Similar 

 to trie preceding, but with somewhat glaucous culms. Basal leaves 2-4 mm. wide; 

 spikes 2-4, mostly clustered at the summit; perigynia oblong, white, compressed, 

 few-nerved, less than 2 mm. long, not fleshy at maturity, abruptly tipped with a 

 short entire nearly cylindric beak; scales brown-purple with white midvein and 

 margins, oval, shorter than the perigynia. Greenland and Lab. (according to 

 Boott). Also in Europe. Summer. 



120. Carex setifolia (Dewey) Britton. Bristle-leaved Sedge. (I. F. f. 

 790.) Glabrous, pale green; culms filiform, smooth, weak, 1-4 dm. long. Leaves 

 filiform, shorter than the culm, less than 0.5 mm. wide; bracts reduced to blade- 

 less sheaths; staminate spike sessile or nearly so; pistillate spikes 2-4, slender- 

 stalked, 4-8 mm. long, loosely few-flowered, the upper commonly overtopping the 

 staminate; perigynia oblong, 3 -angled, 2 mm. long, polished and nearly olack when 

 mature, faintly few-nerved, tapering into a short entire beak; scales ovate, hya- 

 line, shorter than the perigynia; stigmas 3. In dry sandy or rocky soil, prefer- 

 ring limestone, N. B. to the N. W. Terr., Penn. , Ky. and Neb. May-July. 



Culm-leaves present, often short ; bracts mainly reduced to bladefess purplish sheaths. 

 Pedunculatae. 

 Staminate spike short-stalked or sessile. 



Perigynia about twice as long as the scales. 121. C. concinna. 



Perigynia not longer than the scales. 122. C. Richardsont. 



Staminate spike long-stalked, commonly with some pistillate flowers at its base. 



123. C. pedunculata. 

 Leaves all basal ; bracts short or long, not sheathing. 



Neither the culm nor the leaves pubescent ; perigynia rounded. Montanae. 

 Plant not stoloniferous. 124. C. pedicellata. 



Plants stoloniferous, the stolons sometimes short. 

 Culms, or some of them, longer than the leaves. 

 Scales smooth or very nearly so. 



Staminate spike conspicuous, 6-18 mm. long. 

 Staminate spike stout, 1-3 mm. thick. 



Plant dark green ; staminate spike very prominent ; peri- 

 gynia broadly oval. 125. C. Pennsylvanica. 

 Plant light green; staminate spike shorter; perigynia ob- 

 long. 126. C. varia. 

 Staminate spike very slender, not over 1 mm. thick. 



127. C. Novae- Angliae. 

 Staminate spike inconspicuous, rarely over 4 mm. long (longer in 

 the variety). 128. C. deflexa. 



Scales, at least the lower, rough-awned. 129. C. praecox. 



Culms, or most of them, much shorter than the leaves. 



Scales light green with purple margins ; perigynia oblong. 



130. C. nigromarginata. 

 Scales green with lighter scarious margins ; perigynia oval. 



13 r. C. icmbellata. 

 Plant pubescent all over; perigynia sharply 3-angled. Triquetrae. 



132. C. pubescens. 



121. Carex concinna R. Br. Low Northern Sedge. (I. F. f. 791.) 

 Culms filiform, smooth, 5-15 cm. tall. Leaves about 2 mm. wide, pale green, much 

 shorter than the culm; bracts reduced to green bladeless sheaths, or the lower one 

 with an erect subulate blade 6-12 mm. long; staminate spike sessile; pistillate 

 spikes 1-3. erect. 4-8 mm. long, about 2 mm. thick, compactly few-flowered; peri- 

 gynia oblong-ovoid, 3-angled, pubescent, short-beaked, few-nerved, about twice as 

 long as the ovate green or purplish scales. In rocky places, Quebec and Out. 

 to Br. Col. Summer. 



122. Carex Richardsoni R. Br. Richardson's Sedge. (I. F. f. 792.) 

 Culms slender, rough, 1-3 dm. tall. Leaves about 2 mm. wide, those of the culm 



