CYPERACEAE (SEDGE FAMILY) 



27 a Pistillate spikes 1-2, about Vi in. long, usually several- 



flowered MUD SEDGE. (C. limbsa.) 



b Pistillate spikes 2-6, 44-4 in. long, 3-8-flowered 



LONG-STALKED SEDGE. (C. pedunculata.) 



28 a Mature perigynia about 44 in. or more long; pistillate 



spikes 2-8-flowered COLLIN'S SEDGE. (C. collinsii.) 



b Perigynia less than 44 in. long 29 



29 a Pistillate spikes 44-44 in. long, on stalks i in. or more 



long, pendulous; perigynia 3-angled 



SPREADING SEDGE. (C. laxiculmis.) 

 b Pistillate spikes not completely as in a 30 



30 a Pistillate spikes % in. or more long, with stalks % in. 



or more long 31 



b Pistillate spikes 44 -4 in. long, sessile or short stalked. . 32 



31 a Pistillate flowers alternately arranged on spike; peri- 



gynia with no beak. .SLENDER WOOD SEDGE. (C, digitalis.) 

 b Pistillate flowers not arranged as in a; perigynia with 



a beak bent outward.LoosE-FLOWERED SEDGE. (C. laxiflbra.) 



32 a Staminate spike %-i in. long, very short stalked .... 33 

 b Staminate spike about 44 in. long, sessile 34 



33 a Plant with stolons; scales of Staminate spike usually 



reddish PENNSYLVANIA SEDGE. (C. pennsylvdnica.) 



b Plant not with stolons; scales of Staminate spike green- 

 ish or brown. . .FIBROUS-ROOTED SEDGE. (C. pedicellata.) 



34 a Stems much shorter than the leaves; perigynia not hairy 



THICKET SEDGE. (C. ptychocdrpa.) 

 b Stems not shorter than the leaves ; perigynia hairy 



EMMON'S SEDGE. (C. varia.) 



35 a Perigynia hairy; pistillate spike usually sessile 36 



b Perigynia not hairy; pistillate spike distinctly stalked.. 37 



36 a Upper Staminate spike stalked; plant not with stolons 



WOOLLY SEDGE. (C. lanuginbsa.) 

 b Upper Staminate spike usually sessile; plant with 



stolons VELVET SEDGE. (C. vestlta.) 



37 a Mature pistillate spike more than 44 in. broad; plant 



light green PORCUPINE SEDGE. (C. hystridna.) 



h Mature pistillate spikes 44 in. or less broad 38 



38 a Plant growing in dense clusters, rather dark green; 



pistillate spikes greenish-purple 



TUSSOCK SEDGE. (C. s trie fa.) 

 b Plants not growing in dense clusters, light green or 



yellowish 39 



39 a Pistillate spikes 1-2, pendulous, on slender stalks, i in. 



or more long MUD SEDGE. (C. limbsa.) 



b Pistillate spikes 2 or more, not all stalked and pendulous 40 



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