418 CXLI. CTPERACEiE. 



Style equal at base. 



Spikelets niany-ilowercd. 



Perianth of G liispid,smootli or plumose 



bristles 5. SciEPUS. 



Periaiitli of 3 scale'', and mostly 3 in- 

 terposed bristles ; outer glumes hairy 6. Fuieena. 

 Spikelets 2-flowered ; perianth of 6 short, 



pilose bristles 22. Scleroch-ETIUM. 



Perianth 0. 



Style equal at base. 



Spikelets many-flowered. 



Glumes simple, without any inner paleae 

 or valves. 

 No disk surrounding the ovary or 



achene 7. Isolepis. 



A thickened 2-3-lobed disk under 



the ovary 10. FiciNiA. 



Glumes having within them either 

 palese or valves. 

 Paletp 2, the larger hyaline, clasping 



the flower 12. Hemicaepha. 



Glumes internally bivalve ; the valves 



hyaline, clasping the flower . . 13. Plattlepis. 

 Spikelets few-flowered, minute, crowded 

 in a head and mixed with large, imbri- 

 cated, membranous bracts . . . .11. Melancranis. 

 Style dilated at base. 



Spikelets many-flowered ; style-base often 



ciliate, deciduous . . ^ 8. FlMBEiSTYLiS. 



Spikelets 2-1 -flowered; achene complete- 

 ly covei'ed by the cup-Uke style-base . 16. Cladium. 

 (2) Flowers all unisexual ; spikelets either monoe- 

 cious or androgynous. 

 Achenes without any special covering. 



Inflorescence diS'use ; achenes stony ; culms 



3-angled, leafy 27. Scleria. 



Spike sohtary, many-flowered ; the terminal 

 flowers female, the rest male, monandrous, 

 with very long linear anthers ; culms flat ; 



leaves equitant 28. Chrtsithrix. 



Male spikes capitate, female axillary ; fruit 



inflated, with sohd beak 32. ArLACOEHYNCiius. 



Achenes enclosed in a sac-like envelope. 



No bristle or awn within the sac of the achene. 



Sacs free in the axil of the glume, 2-dentate 29. Caeex. 

 Sacs 3-angled, embracing the rachis of 



spikelets 31. Schcenoxiphium. 



A hooked awn projecting from the sac of 

 achene 30. Uncinia. 



Tribe 1. Ctpeeeje. (G-en. 1-3.) 

 1. CYPERUS, Linn. 

 Spikelets many-flowered. Glumes distichous, all floriferous 



