Cyperus.'] clvi. CYPERACEiE (clarke). 311 



Leaf-slieatbs (and often leaves) pubescent . 18. C. somnliensi^. 



Spikelets medium-sized, usually i in. wide or more. 

 Glumes strongly mucronate or subaristate. 



Stems tufteJ, thickened at tlie base . . . 3. C. TeneriJJ.E. 



Stems on a horizontal stout rhizome, not 



thickened at the base . . . . 15. C poecilus. 



Glumes obtuse, sometimes miuutidy apiculate. 

 (Spikelets white, straw-coloured, cinnamon- 

 coloured or yellow.) 

 Basal sheaths not bre.iking up into fibres. 

 Rhizome very short or 0. 



Spikelets 5-20 to a bead, ^ in. wide. . 11. C. compacius. 



Spikelets 3-8 to a head, |— ^ in. wide . 13. C. margaritaceus. 

 Rhizome very long, straight, rigid 



Spikelets 8-16-flowered . . . .12 C. angolensis. 



Spikelets 3-1-flowered .... 14. C. ochrocephulus. 

 Ba^al sheaths breaking up into fibres. 



Head of 3-6 spikelets . . . . .10. C. niveoides. 



Head dense, of numerous spikelets . . 17. C zanzibarensis. 



§ iii. CONGLOMERATJE. — None annuals. The dense heads few in a simple umbel, 

 or agglomerated iiit J 1 (sometimes very large) head. Spikelets stiav.- coloured to 

 ferruginous- brown, or reddish in C. Frerei: 

 Roots woolly. 



Glumes not very approximate; spikelet 8-16- 

 flowered . . . . . . . 19. C. conglomeratus. 



Glumes very approximate ; spikelet often 20-40- 

 flowered. 

 Stem rather slender, at the top more or less 



trigonous 20, C. cruentus. 



Stem thicker, terete, striate, at the top hardly 



trigonous 21. C. effusvs. 



Roots not woolly. 



Leaves coarse, tough ; spikelets straw-colour to 



brown 22. C. marit units. 



Leaves green, flat ; spikelets tinged with -red . 23. C. Frerei. 



§iv. Geaciles. — Slender, green annuals. Spikelets slender, green. Umbel 

 loose. Nut verrucose, hardly cancellate . . . . 24. C. cancellatus. 



§v. Uncinate. — Annuals. Spikelets small or medium-sized. Spikes umbelle.l. 

 Glumes more or less mucronate. 



Glumes minutely mucronate. Spikes golden-brown .25. C. amabilis. 

 Glumes distinctly mucronate. 



Mucro long recurved ; glume strongly 3-nerved . 26. C. uncinatus. 

 Mucro shortly exserted ; glume hardly 3-nerved . 27. C. reduncus. 



% vi. DiFFOEMES.— Annuals or weak perennials. Spikes umbelled, usually very 

 numerous. Glumes small, muticous or very nearly, so. 

 Spikelets numerous in each spike. 

 Stems annual, tufted. 



Spikelets dusky or brownish . . . . 28. T. diffurmu. 



Spikelets whitish-green, glistening . . .29. C. microlepu. 



Stems subsolitary, on a long rhizome . . .30. C. duhruudachyus. 



