CYPERACEAE (SEDGE FAMILY) 



64 a Single spikes, not clusters of spikelets, more than % in. 



long, cylindric to linear; staminate flowers usually 



conspicuous 65 



b Spikes or spikelets % in. or less long; staminate flowers 



not conspicuous 67 



65 a Perigynia densely hairy; spikes VQ-% in. long 



DOWNY GREEN SEDGE. (C. virescem.) 

 b Perigynia not hairy; spikes ^-4 in. long 66 



66 a Spikes densely-flowered except at the base 



GRACEFUL SEDGE. (C. gracillima.) 

 b Spikes very loosely-flowered throughout 



SUMMER SEDGE. (C. aestivalis.) 



67 a Spikelets few, clustered in a short, terminal head about 



% in. long OVAL-HEADED SEDGE. (C. cephalophora.) 



b Spikelets not completely as in a 68 



68 a Spikelets 3-6, globose, olive-green ; perigynia spreading 



when mature LITTLE PRICKLY SEDGE. (C. sterilis.) 



b Spikelets not globose 69 



69 a Average leaf V in. or more broad, light green ; the 2 or 



3 upper spikes close together, the others scattered, 

 very light green, the lowest often compound 



BUR-REED SEDGE. (C. sparganioides.) 

 b Plants not completely as in a . -. 70 



70 a Lower spikelets usually compound, not usually subtended 



by several scales, the perigynia spreading 71 



b Lower spikelets not compound, usually subtended by 



several scales 73 



71 a Spikelets comparatively loosely arranged on the stem; 



the leaves much shorter than the stem 



YELLOW-FRUITED SEDGE. (C. xanthocarpa.) 

 b Spikelets arranged more or less compactly on the stem ; 



leaves about as long as the stem 72 



72 a Mature perigynia about % in. long 



AWL-FRUITED SEDGE. (C. stipata.) 

 b Mature perigynia about % in. long 



Fox SEDGE. (C. vulpinoidea.) 



73 a Mature spikelets less than 1 A in. broad, comparatively 



loosely-flowered ; perigynia narrow 



BROOM-LIKE SEDGE. (C. bromoides.) 

 b Mature spikelets about V in. broad, densely-flowered.. 74 



74 a Perigynia blunt, without a beak 



HIRSUTE SEDGE. (C. triceps.) 

 b Perigynia tapering into a beak 75 



75 a Perigynia conspicuously tapering and spreading when 



mature, causing spikelets to appear somewhat bristly. . 76 

 b Perigynia not spreading but ascending 77 



130 



