SEDGE FAMILY. 



Scales acute, cuspidate, acuminate, or awned 

 Pengynia obtusely vanned 



Perigynia obovoid. iK"-iS" long 

 Pengynia oblong, narrow, about 2" Ion* 

 Pengynia sharply .vnngled. 



Spikes drooping or spreading; leave* \"-4 



- 





ride, or wider in thr 





in. C 



/*///' 



wtmtt 



115- C. 



,-,,. -- ,V'-6" wide. 



Leaves broad, 6 -18 wide. 



Bracts leafy the upper usually overtopping the nikr 

 Bracts mostly reduced to purple leafless sh, 

 Plants distinctly glaucous. 



1'istillate spikes drooping on hair-like stalk- 

 Pistillate spikes erect. 



Basal leaves much longer than the culm. 

 Basal leaves shorter than the culm or equalling it 

 leaves 6"-i2" wide. 

 .Leaves i"-2" wide. 



Scales acute; perigynia yellow, purple ,,r mottled. 116. C. **. 



Scales obtuse, or the lower acute ; perigynia pale green l^SHT" 



00 Perigynia white, yellow or becoming brown |; K ., toftMt 



Perigynia beakless. ' - 



Pengynia with a short cylindric beak; arctic species. 



H Leaves and culms almost capillary; bracts reduced to bladeless shea: 



J Scales of the spikes leaf-like, elongated. I'IIYI.MMTAOIYAK. 

 Lower scales i" wide or less, not concealing the perigynia. 



Body of the perigynium oblong; beak flattened. i s r H;t;J,m 



Body of the perigynium globose; beak subulate. 

 Lower scales i"-2" wide, concealing the perigynia. 



* Perigynia more or less pubescent (becoming glabrous in no 

 Culm-leaves present, often short; bracts mainly reduced to bladelem puri> 



Cl'LATAE. 



Staminate spike short-stalked or sessile. 



Perigynia about twice as long as the scales. 



Perigynia not longer than the scales. , A'uvhtntjMf . 



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



JJJ. t /Wt/MJf< tt/4/4. 



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



Neither the culm nor the leaves pubescent, perigynia rounded . \B. 



Plant not stoloniferous. :*lt. 



Plants stoloniferous, the stolons sometimes short. 

 Culms, or some of them, longer than the It 

 Scales smooth or very nearly so. 



Staminate spike conspicuous, .V'-9" long. 

 Staminate spike stout, h"-i '." thick. 



Plant dark green; Staminate spike very prutnint -nt. pcrigrata bruaUjr 



oval. 

 Plant light green; Staminate spike shorter; pcrigynw oblong. 



Staminate spike very slender, not over '.-" thick. 177. ( v -/i*-. 



Staminate spike inconspicuous, rarely over 2" long i longt 



13*. ' 



Scales, at least the lower, rough-awned. 1 39. C- 



Culms, or most of them, much shorter than the 1. 



Scales light green with purple margins; perigynia ol>; 

 Scales green with lighter scarious margins; peiv. 

 Plant pubescent all over; perigynia sharply ^-angled. TRiyrKTKAK. 13*. C. 



(b) Spike solitary (except in no. 140), sometimes </;.- 

 PHYSOCKPMAI \i 



Xo. i; 



I.J3. C". Frtttri. 



leaves i'-2' wide, thick, spreading. 

 Leaves K"~3" wide. 



Staminate and pistillate spikes on different culms So K PIN \i 

 Leaves longer than the culm ; perigynia obovoid; southern 

 Leaves shorter than the culm; perigynia oval: northern species. 

 Staminate and pistillate flowers in the same spike. 



Scales of the spike leaf-like, elongated. PHYI.I...M u in \i 

 Lower scales i" wide or less, not enclosing the perigynia. 

 Body of the perigynium oblong, its beak flatten. <! 

 Body of the perigynium glolwse. its t>eak subulate. 

 Lower scales i" -2 '2 wide, enclosing the perig^ 

 Scales of the spike short, normal. 



Leaves %' f -\" wide; arctic and west 



Spike solitary, androgynous; perigynium beak stout, long. 

 Spikes 2-4, the Staminate uppermost; pengynn 

 Leaves %" wide or less. 



Perigynia obtuse, beakless; swamp species. LKP- 



C 



Perigynia obovoid-oval, beaked; prairie species. FlLIFOUAE. 



'.!/ . 



