SEDGK FAMILY. 2 9 , 



2. STAMIXATK KLOWKRS VARIOI-SI.V MINULED WMII .HI rTTU in ,s THR i 



OCCASIONALLY FORMING \VHOI.K SPIKKS. (See HOS. 143-1 ; 



Perigynia radiately spreading or reflexed. 

 Perigynia erect or appressed. 



Perigynia wingless, the inner face flat. 



Perigynia winged, the inner face com-av. ,l , 



3. STAMINA TK I-LO\VKRS AT THK HASKS 01 i m. si-iw i 



(a) Perigynia without a marginal .- i,,^. N,> , : . , , ^ 



Perigynia radiately spreading, or reflexed when old. 



Perigynia distinctly nerved on both faces, the beak rough 



Perigynia lanceolate: beak more than half as l,,n K .,-, the Unly i-, C It 



Perigynia ovate; beak about one-third as I.MIK as t) u txxly, abrupt i I/,.* 



Perigynia faintly nerved on the outer face, nerve 1- : ( s,, ,, n t ),, . . . mi- ^hi.h 



Perigynia ascending, appressed or somewhat spreading when old not radiating 

 Perigynia ovate, oval, oblong or elliptic. 



Bracts short, scale-like or none, the low. .illy longer th.m it* t 



Spikes distinctly separated or the upper close tog-!' 

 Heads silvery green or nearly white. 

 Heads brown or brownish. 



Spikes few-flowered, 2" -3" long; perigynia lean than 



Spikes dense, many- flowered; perigynia about i" long, the brk 



Spikes densely clustered at the top of the mini. ..r tin lower M-par..' 

 Spikes green or greenish brown. 



Spikes several in an ovoid cluster; perigynia ovate, rough braked 



t8o 



Spikes only 2-4; perigynia elliptic, beakleM. 181 ' >rm. 



Spikes dark brown; arctic species. 

 Culms slender, stiff, erect. 



Leaves involute; scales about equalling the perigynia. 187. (' /Mfv*.i 

 Leaves flat; scales shorter than the perigynia. 183. C. laeopim-t 



Culms weak, spreading or reclining. 184. C. gh 



Bracts bristle-form, much elongated, much exceeding the 2-4 oblong i. 



185 " 



Perigynia lanceolate or ovate-lanceolate. 



Perigynia nerveless; spikes oblong or subglobose. 186. C. Dnrtjrm 



Perigynia strongly several-nerved; spikes narrowly oblong cylindru- 1*7 ( 



(b) Perigynia with a narrow or broad marginal .< ing. N"'>- 1^ >-5 



Perigynia lanceolate or ovate -lanceolate, 2-5 times as IOUK a- 



Top of the culm nodding; arctic and northwestern spi 188. C. fir a 



Culms strictly erect, mostly stiff. 



Perigynia nerveless, broadly winged ; northwestern species. 189. C. .ma* 



Perigynia several-nerved on both faces. 



Perigynia broadly winged; staminate flowers intermixed with the piatillatr 



Perigynia narrowly winged; staminate flowers all basal 



Spikes l A'-i' long; perigynia about 4" long. 191. C. Mitikimgmmfni 



Spikes 2" -8" long; perigynia 2" -3'' long. 



Spikes oblong or oval; perigynia ascending or erect. 

 Spikes green-brown, blunt. 



Spikes bright brown, pointed; perigynia lanceolate. 193. 

 Spikes rather dark brown, blunt; perigynia ..\att lanceolate. 



Spikes subglobose ; perigynia spreading, atk-ast \\lun ..],! : 



Perigynia ovate, not more than twice as long as wide (longer in s.mu- forms of r 

 Perigynia narrowly winged above; heads greenish brown. 

 Perigynia broadly wing-margined. 

 Perigynia spreading or ascending. 

 Spikes silvery green. 

 Spikes yellowish brown or-greenish. 

 Perigynia erect or appressed. 



Heads silvery green or nearly white; sea-beach species. 

 Heads brown-green; meadow or marsh species. 



Perigynia orbicular, very broadly ovate or somewhat obovate, sometii 

 Heads green-brown. 



Perigynia spreading or ascending; achene sessile. 

 Perigynia erect, 2" -2*?" broad; achene short-stalked 



, 



Heads silvery green, yellowish or whitish 

 Perigynium-wing'nrm; achene sessile. 

 Perigyni- achene stalked 



igynia narVow 

 CYPEROIDEAE. 



Perigynium-wing'nrm; achene sessile. 

 Perigynium-wing membranous; achene stalked 

 Perigynia narVowly linear-lanceolate, tapering into a subulate beak *-Jtn 



