B. 



Scales of the spikelets dis- 

 tant ; leaves 2 mm. wide or 

 less ; slender sedges 

 Spikelets 4-5 mm. long 

 Spikelets 2 mm. long 

 or less 

 Umbel compound 



Spikes ovoid, 8-12 mm. 

 thick 



Spikes long-cylindric, 5-7 

 mm. thick 

 Spikelets 15-25 flowered 



Scales acute or mucronulate. 

 awnless 



Scales awned, appressed 

 Spikelets nearly or quite terete, break- 

 ing up at the nodes into l-fruited 

 joints 

 Spikes solitary or 2 ; culm filiform ; 

 perennial by rootstocks 

 Spikes umbellate ; culms stout to slen- 

 der; annuals, or at least without root- 

 stocks. 



Scales distant, not overlapping 

 Spikes loose ; spikelets yellowish- 

 brown 



Spikes dense ; spikelets red brown 

 Scales overlapping 



28. C. tetiuis 

 nanus 



29. C. 



30. C. 



31. c. 



32. 

 33- 



35- 

 36. 



?>7- 



C. 

 C. 



Mutisii 

 ligularis 



hnmneiis 

 confertus 



34. C.filifonnis 



C. 

 C. 

 C. 



Type species, Cypcrus esculentiis, L. 



fcrax 

 Vahlii 

 spcciosus 



I. Cyperus laevigatus, L. Mant. 1 79. I77r. 



Jnncellus laevigatus, Clarke in Hook. f. Fl. Brit. Ind. VI : 596. 



1893. 

 In marshes along the coast. Between Kingston and Spanish 

 Town (Fawcett 8142) ; Rockfort (Britton 787 ; Harris 9564.) Widely 

 distributed in warm and tropical regions both of the old world and 

 the new. 



2. Cyperus DENSUS, Link, Jahrb. Ill: 83. 1820 



Cyperus Iielvus, Liebm. Mex. Halvgr. 9. 1850. 



Cyperus varicgatus, Griseb. Fl. Br. W. I. 562. 1864. Not 



H. B. K. 



Pycreus helvus, Clarke in Urban, Symb. Ant. II : 19. 1900. 

 Frequent in marshes and ditches. Temple Hall (Harris 9392) ; 

 Port Antonio (Britton 872) ; Stony Hill (Britton 833). Tropical 

 America. 



3. Cyperus odoratus, L. Sp. Pi. 46. 1753. 



Cyperus polystac/iyus, K.Br. Prodr. 2 1 4. 1 8 10. 



Pycreus poly St achy us, Bea.uv. Fl. d'Owar. II: 48. 1807. 



Pycreus odoratus. Urban, Symb. Ant. II: 164. 1900. 

 In marshes near the coast, in the vicinity of Port Antonio (Mar- 

 ble 847 ; Britton 901). Not hitherto reported from Jamaica. Widely 

 distributed in tropical regions. 



4. Cyperus paniculatus, Rottb. Descr. et Ic. 40. 1773. 

 Pycreus paniculatus, Nees, Linnaea, IX : 283. 1834. 

 Reported from Jamaica by Clarke, as collected by Purdie, under 



