Cyperns\ 



Cyperacece. 



15 



15. 



Nut obcordate 9. 



Nut broadly obovoid . . . .10. 

 Stigmas 3. 

 Spikelets all or most in a single terminal 

 head. 



Rhachilla winged 11. 



Rhachilla not, or hardly, winged. 



Stem tall 12. 



Stem short. 



Perennial, heads large . . . 13. 

 Annual, heads small . . .14. 

 Spikelets in umbelled heads or spikes. 

 Spikelets in globose compact heads, or 

 digitately or stellately clustered on 

 the rays of a simple or compound 

 umbel. (See also 31 compressus.) 

 Nut long-beaked, margins corky 

 Nut not, or minutely, beaked, margins 

 not corky. 

 Spikelets in globose compact heads 16 

 Spikelets digitately or stellately 

 clustered. 

 Annual, glumes with long re- 

 curved cusps. 

 Nut narrowly oblong, granu- 

 late 



Nut obovoid, smooth 

 Perennial, except C. flavidtis. 

 L. I in. broad, or less. 

 Glumes orbicular. 

 Spikelets \-% in. long 

 Spikelets ^q-\ in. long . 

 Glumes oblong . 

 L. \~\ in. broad 

 Spikelets spicate, spikes terminating 

 the rays or raylets of a usually com- 

 pound umbel. 

 Spikelets usually long, and loosely 

 spicate. 

 Bracts o, or very short; 1. o, or 

 short. 

 Nut oblong, half as long as the 



glume 



Nut elliptic, not half as long as 

 the glume .... 

 Bracts leafy, one or more very long. 

 Nut narrow, half as long as the 

 glume, or more. 

 L. 1-2, or o 

 L. many. 



Spikes and spikelets suberect 26. 

 Spikes and spikelets spread- 

 ing ... 27. 

 Nut broad, half as long as the 

 glume, or shorter. 



C. PUNCTICULATUS. 

 C. GLOBOSUS. 



C. BULBOSUS. 



C. CONGLOMERATUS* 



23- 



24. 



25. 



C. ARENARIUS. 

 C. ARISTATUS. 



C. PLATYSTYLIS. 

 C. DIFFORMIS. 



17- 



C. 



CASTANEUS. 



18. 



C. 



CUSPIDATUS. 



19. 



c. 



Haspan. 



20. 



c. 



FLAVIDUS. 



21. 



c. 



PULCHERRIMUS, 



22. 



c. 



DIFFUSUS. 



C. ARTICULATUS. 

 C. CORYMBOSUS. 



C. DEHISCENS. 

 C. DISTANS. 

 C. NUTANS. 



