592 CYPERACE^E. (SEDGE FAMILY.) 



Stigmas 3 ; spikes erect or ascending. 



Perigynium hairy. Spikes very large, globose 6 



Spikes very small, sessile or. nearly so . . 81-83,85-92 



Spikes cylindrical, heavy 24-28 



Perigynium granular-rougheued 2S 



Perigynium smooth, 

 Thin and turgid, loosely enclosing the achene. Beakless ... 58, 59 



Beaked . . . .5-17 

 Firm in texture, not inflated, 



Long-beaked, deeply toothed 2-4,26,28 



Less prominently beaked, short-toothed, sharply 3-angle.d . . . .69-74 



Wholly beakless and pointless 58, 59, 63, 78, 79 



Very small, black and shining ; leaves capillary 80 



Culm and leaves thinly pubescent 64 



Perigyuium more or less pointed or beaked. 



Spikes spreading or drooping 51-53,68-70,75 



Spikes erect 60-62,65-68,71-78 



* 1. PHYSOCARP.E. -t- 1. Pauciflbrce. 



1. C. pauciflbra, Lightf. (PI. 5, fig. 1-16.) Very slender but erect, 

 6-18' high; leaves very narrow, much shorter than the culm; stamiuate and 

 pistillate flowers 2 - 5 ; perigynium at maturity easily detached. Cold sphag- 

 num swamps, New Eug. to N. Peun. and Minn. ; local. (Eu.) 



* 1. 4- 2. LupuFmcE. 

 H- Teeth of the perigynium stronjty rrflexed. 



2. C. sublllata, Michx. Green, very slender but erect, 6' -2 high; 

 leaves narrow, somewhat shorter than the culm; bracts leafy, sheathing; 

 pistillate .spikes 2-4, scattered, 2-6-flowered; perigynium deflexed. Deep 

 sphagnum swamps, K. I. to E. Peim., and southward; very local. 



++ -t-t- Teeth erect or spreading. 

 = Whole plant yellowish ; perigynium little or not at all inflated. 



3. C. Michauxiana, Boeckl. Slender but stiff and erect, 1-2 high; 

 leaves narrow and firm, shorter than the culm; spikes 2-3, the lowest 

 usually remote and short peduncled, the remainder aggregated and sessile ; 

 staminate spike small, wholly sessile ; perigynium not inflated, erect or spread- 

 ing, twice longer than the blunt scale. (C. rostrata, Michx.) Bogs and lake- 

 borders, mountains of N. H. and N. Y., and westward to L. Superior ; local. 



4. C. folliculata, L. Stout, 2-3 high; leaves very broad and flat, 

 lax ; pistillate spikes 3-4, scattered, all but the uppermost prominently pe- 

 duncled ; stamiuate spike short-peduncled ; perigyuium larger, inflated, the 

 scale awned and nearly as long. Cold swamps, New Eng. to N. J. and Penn., 

 and west to Mich. ; rather local. 



= = Plant green ; perigynium much inflated. 



5. C. intumescens, Eudge. Slender, 18-30' high; leaves narrow; 

 pistillate spikes two, loosely 1-8-flowered, the perigynium erect-spreading, 

 not prominently many-nerved. Wet pastures and swamps ; common. 



6. C. Grayli, Carey. Larger and stouter; leaves broad and flat, 3-4" 

 wide; pistillate spikes 1 or 2, the lowest often peduncled, perfectly glob- 

 ular and compactly 1 2 - 30-flowered, the perigynium spreading or deflexed 

 an:l prominently many-nerved. Meadows and copses, Vt. to 111., and south 



