176 



CYPERACEAE 



Terminal spike staminate. 

 Perigynia and foliage glabrous, or if pu- 

 bescent the perigynia strongly biden- 

 tate; achenes triangular or lenticular. 

 Perigynia rough papillose, conspicuously 



beaked. 13j 

 Perigynia not rough papillose. 



Perigynia beakless or very short 

 beaked; achenes triangular. 

 Lateral spikes drooping on slen- 

 der peduncles, at least at 

 maturity. 

 Perigynia glaucous, flattened. 

 Perigynia not glaucous, not 

 flattened; spikes narrow. 

 Lateral spikes strictly erect. 

 Perigynia with strongly bidentate 

 beak, or if not, the achenes 

 lenticular. 

 Acheneslenticular; perigynia dull. 

 Scales obtuse to acuminate, 

 not long-aristate; achenes 

 not constricted. 

 Scales broad, long-aristate; 

 achenes strongly constricted 

 at the middle. 

 Achenes triangular. 



Perigynia coriaceous, little if 

 any inflated, often pubes- 

 cent; bracts sheathless. 

 Perigynia membranous or 

 papery, from little to 

 much inflated, never 

 pubescent (rarely his- 

 pidulous); or if slightly 

 coriaceous the lower 

 bract long-sheathing. 

 Perigynia little inflated, 

 abruptly beaked; pistil- 

 late scales usually red- 

 dish or chestnut brown 

 tinged; lower bracts 

 strongly sheathing. 

 Perigynia little to much 

 inflated; pistillate 

 scales not reddish 

 brown or chestnut, 

 or if somewhat so, 

 lower bract. not 

 strongly sheathing. 



30. Pallescentes. 



31. Anomalae. 



32. LlMOSAE. 



33. SCITAE. 



34. Atratae. 



35- RlGIDAE. 



36. Cryptocarpae. 



37. HlRTAE. 



38. Flavae. 



