372 CYPERACE.E. (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 so. 

 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 eiliate 5 



Scales not ciliate. 



Spikes greenish ; culrns 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 26 



Spikes thick and long ; perigynium inflated, 



Greenish straw-colored, slender-beaked, conspicuously more than 10-nerved 34 

 Straw-colored or often purplish, 



More or less ascending 36, 37 



Conspicuously squarrose 38, 39 



Spikes all erect, 



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

 Beak short, bifid 31 



