372 CYPERACEJ3. (SEDGE FAMILY.) 



More or less thick and rounded. 

 Heads fulvous • 85 



Heads silvery or silvery-tawny 72, 73, 74 



Perigynium ovate, wing-margined 86, 87 



Perigynium ovate, not margined 75, 76, 77 



Perigynium broadly obovate, nearly pointless 22 



Stigmas three. 



Pistillate spikes nodding 25 



Pistillate spikes erect . 23, 24 



Intermediate spikes of the silvery or tawny interrupted head staminate, stigmas two. 



Perigynium short and broad, dark-colored 68 



Perigynium ovate or ovate- lanceolate, straw-colored 67, 69 



Perigynium long-lanceolate, silvery-green . 72 



Terminal spike or spikes entirely staminate. 

 Stigmas two. 

 Perigynium strongly nerved. 



Plant stout . 40 



Plant very slender 45 var. juncella. 



Perigynium nerveless or nearly sa 

 Bracts all leaf-like, 



Scales ciliate at top . 41 



Scales not ciliate . .42 



Bracts not conspicuously leafy. 

 Spikes rounded or oval 



Staminate spike short-stalked . 35, 45 var. 2 



Staminate spike sessile . . 47, 50 



Spikes oblong or long-cylindrical 



Perigynium ovate, green or brown-purple 43, 44, 45 



Perigynium obovate, yellow or whitish 20 



Stigmas three. 

 Perigynium hairy. 

 Pistillate spikes few-flowered, almost globular, mostly sessile. 



Scales ciliate . . . 5 



Scales not ciliate. 

 Spikes greenish ; culms slender . . ...... 7, 8 



Spikes greenish or whitish ; culms very short 8, 9 



Spikes colored . . 6 



Pistillate spikes few-flowered, linear ; plant delicate 12 



Pistillate spikes several to many-flowered, oblong or cylindrical. 



Perigynium conspicuously nerved 32 



Perigynium nerveless or nearly so. 



Plant hairy throughout 13 



Plant smooth 30 



Perigynium smooth. 

 Pistillate spikes pendulous or nodding. 

 Beak slender, longer than body of perigynium ; spikes greenish-white . 29 



Body of perigynium as long or longer than beak. 



Spikes small, 6 or less-flowered ; plant delicate 27 



Spikes nearly globular, pendulous, very dark 48 



Spikes very loosely-flowered, long-linear ....... 20 



Spikes thick aud long ; perigynium inflated, 

 Greenish straw-colored, slender-beaked, conspicuously more than lQ-nerved 34 

 Straw-colored or often purplish, 

 More or less ascending •*..,..., 36, 3? 



Conspicuously squarrose 38, 39 



Spikes all erect, 

 Short-oblong or round, densely-flowered, approximate. 

 Beak short, bifid , i * • SI 



