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CYPERACEAE 



21. Laxiflorae. 



Sheaths and base of culm strongly purplish; staminate 



scales purplish. 

 Sheaths not purplish tinged, the base of culms but rarely so; 

 staminate scales never purplish. 

 Perigynia acutely triangular, short tapering at base. 

 Leaf-blades very smooth (except edges), the larger 

 12 mm. wide or more, those of fertile culm much 

 smaller than those of sterile; perigynia smooth. 

 Leaf-blades hispidulous on veins, io mm. wide or 

 less; those of fertile culm moderately smaller 

 than those of sterile; perigynia minutely 

 roughened. 

 Staminate spike sessile or nearly so; peduncles 



short, erect. 

 Staminate spike usually strongly peduncled; 

 lower peduncles capillary. 

 Perigynia short-beaked; second bract and 

 leaves usually exceeding culm; blades 2.5- 

 5 mm. wide, erect. 

 Perigynia beakless or nearly so; second bract 

 and leaves usually exceeded by the culm; 

 blades 4-8 mm. wide, spreading. 

 Perigynia obtusely triangular, long tapering at base, 

 smooth. 

 Pistillate scales very truncate; blades 15-40 mm. 

 wide; culms very strongly flattened and wing- 

 margined. 

 Pistillate scales acuminate to strongly cuspidate. 

 Culms strongly purplish tinged at base (sterile 

 culms conspicuous; perigynia with abruptly 

 bent beak). 

 Culms not purplish tinged at base. 



Perigynia with abruptly bent minute beak 

 (sterile shoots developing conspicuous 

 culms). 

 Perigynia with straight prominent beak. 



Perigynia fusiform; spikes 5-15-flowered; 

 sterile shoots developing conspicuous 

 culms. 

 Perigynia obovoid; spikes many-flowered; 

 sterile shoots reduced to tufts of 

 leaves. 

 Perigynia appressed-ascending, 3.5 

 mm. long or less; fertile culms 

 lateral; plant densely cespitose. 

 Perigynia spreading-ascending, 3-4.5 

 mm. long; fertile culms lateral and 

 central; plant loosely cespitose. 



22. Granulares. 



Rootstocks not long creeping; staminate spike short- 

 stalked; bracts overtopping spikes. 



72. C. plantaginea. 



73. C. platyphylla. 



74. C. abscondita. 



75. C. digitalis. 



76. C. laxicnlmis. 



77. C. albursina. 



78. C. laxiflora. 



79. C. blanda. 



80. C. styloflexa. 



81. C. anceps. 



82. C. slriatula. 



