Cyperus. | CLVI. CYPERACEE® (CLARKE), 311 
Leaf-sheaths (and often leaves) pubescent . 18. C. somaliensis. 
Spikelets medium-sized, usually -in, wide or more. 
Glumes strongly mucronate or subaristate. 
Stems tufted, thickened at the base . E ‘ 
Stems on a horizontal stout rhizome, not 
thickened at the base ‘ A : . 15. C. pecilus. 
Glumes obtuse, sometimes minutely apiculate. 
(Spikelets white, straw-coloured, cinnamon- 
coloured or yellow.) 
Basal sheaths not breaking up into fibres. 
Rhizome very short or 0. 
3. C. Teneriffe, 
Spikelets 5-20 to 4 kead, 2 in. wide. AAS Of compactus. 
Spikelets 3-8 to a head, 1—4 in. wide . 18. C. margaritaceus. 
Rhizome very long, straight, rigid. : 
Spikelets 8-16-flowered . c E . 12. C. angolensis. 
Spikelets 3-1-flowered . 3 5 . 14. C. ochrocephalus. 
Basal sheaths breaking up into fibres. cies 
Head of 3-6 spikelets . peel e : . 10. C. niveoides. 
Head dense, of numerous spikelets ‘ . 17. C. zanzibarensis. 
Siii. Conatomeratx.—None annuals, The dense heads few in a simple umbel, 
or agglomerated into 1 (sometimes very large) head. Spikelets straw-coloured to 
ferr uginous-brown, or reddish in C. Freret. 
Roots woolly, é 
Glumes not very approximate; spikelet 8-16- 
flowered 5 f : ‘ : . 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 
tigtnous ee es Bl. C. auaus: 
Roots not woolly. 
Leaves coarse, tough ; spikelets straw-colour to = 
brown é e ‘ < ° . 22. C. maritimus. 
Leaves green, flat; spikelets tinged with red . 23. C. Frerei. 
S iv. GRACILES.—Slender, green annuals. Spikelets slender, green. Umbel 
loose. Nut verrucose, hardly cancellate . . ° . 24, C, cancellatus. 
$v. Uncrnara.—Annuals. Spikelets small or medium-sized. Spikes umbelled. 
Glumes more or Jess mucronate. oe 
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. DirFormEs.—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 Seiten . . . ‘ oe me sibel 
Spikelets whitish-green, glistening . < »- 29. C. mi . 
Stems subsolitary, oe a ‘cig rhizome . . . 80. C. dichroustachyus. 
