29. 



C. 



EXALTATUS. 



3°- 



C. 



TUBEROSUS. 



3i- 



C. 



COMPRESSUS. 



32. 



c. 



PROCERUS. 



33- 



c. 



ZOLLINGERI. 



34- 



c. 



ROTUNDUS. 



35- 



c. 



STOLONIFERUS. 



1 6 Cyperacece. [Cypems. 



Rhachis of spikes hispidulous 28. C. PILOSUS. 

 Rhachis of spikes glabrous. 

 Glumes with a green cusp. 

 Spikelets ^ in. broad 

 Spikelets g-J in. broad. 

 Spikelets turgid . 

 Spikelets compressed . 

 Glumes without a green cusp. 

 Stem tall, triquetrous. 

 Tip of glumes rounded 32. 

 Tip of glumes acute or 

 subacute 

 Stem trigonous. 

 Annual 

 Perennial 

 Spikelets very short, densely crowded 

 in cylindric spikes. 

 Styles 3. 



Spikes and spikelets spreading. 

 Spikes 1-1^ in., red-brown . 36. C. DIGITATUS. 

 Spikes |-i "in., green . . 37. C. ELEUSINOIDES. 

 Spikes and spikelets suberect . 38. C. PLATYPHYLLUS. 

 Styles 2 39. C. ALOPECUROIDES. 



The following is the arrangement followed by Clarke in Fl. B. Ind., 

 with the numbers in brackets as they are arranged in this work : — 



Gen. Pycreus. Nut laterally compressed, stigmas 2. 1, stramineus 



(Cyp. 4) ; 2, sanguinolentus (Cyp. 7) ; 3, nitens (5. C. pumilus) ; 4, 



pumilus (6. C. hyalinus) ; 5, capillaris (10. C. globosus) ; 6, polystachyus 



(Cyp. 8) ; 7, puncticulatus (Cyp. 9). 



Gen. Juncellus. Nut plano-convex, dorsally compressed, stigmas 2. 



1, alopecuroides (Cyp. 39); 2, pygmseus (Cyp. 3). 

 Gen. Cyperus. Nut trigonous or triquetrous, rarely dorsally com- 

 pressed, stigmas 3, rarely 2. 



Subgen. I. Anosporum. Style entire, or with 3 minute stigmas. 



1. C. Cephalotes (1). 

 Subgen. II. Pycnostachys. Style compressed, stigmas capillary. 

 Sect. 1. Natantes. 2 C. platystylis (15). 

 Sect. 2. Amabiles. Slender annuals, spikelets small, glumes 



mucronate; 3 castaneus (17); 4, cuspidatus (18). 

 Sect. 3. Difformes. Small, or middle-sized, annuals or biennials, 

 rootstock o, or creeping in C. Hasftan; 1. and bracts moderately 

 long,- narrow, weak; infi. umbellate, rarely capitate; spikelets 

 small, numerous; glumes scarcely cuspidate; 5, difformis (16); 

 6, pulcherrimus (21); 7, Haspan (19); 8, flavidus (20). 

 Sect. 4. Conglomerate Rootstock woody, creeping, root-fibres 

 thick, often woolly ; infl. umbelled or of one head ; 9, arenarius 

 (13); 10, conglomeratus (12); 11, pachyrhizus (12 conglome- 

 rate j3). 

 Sect. 5. Diffiisi. Tall, or middle-sized perennials, 1. green, 

 somewhat broad, often 3-veined ; umbels compound, generally 

 decompound; 12, diffusus (22); 13, pubisquama (12 diffusus (3 

 pubisquama). 

 Subgen. III. Choristachys. Infl. umbellate, spikes often more or 



