FLORA OF ADEN . 
353 
Genera about 65 ; species about 3,000. 
Distribution : — All over the world. 
Cyperus Linn, 
Perennial, rarely annual, glabrous herbs ; rhizome creeping, short or 
long or 0. Leaves mostly towards the base of the stem, occasionally 
reduced to sheaths. 
Spikelets in solitary globose or umbellate heads or spikes ; involu- 
oral bracts 1 or more, foliaceous ; bracteoles under the secondary 
divisions of the inflorescence ; rhachilla usually persistent, not,Jor in a 
few species disarticulating towards the base, sometimes with mem- 
branous wings derived from the persistent glume-bases. Glumes 
distichous, the 2 lowest empty, those above 2-sexual, all nearly equal, 
deciduous from below upwards, the uppermost 1-3 sterile or empty ; 
hypogynous scales or bristles 0. Stamens 1-3 ; anthers linear or 
oblong. Ovary compressed, style short or long or obsolete ; stigmas 
2 or 3. 
Fruit trigonous, triquetrous, obovoid, or plano-convex. 
Species about 360. 
Distribution : — All warm and temperate regions. 
Glumes not very approximate ; spikelets 8-16-flowered . . 1. C. conglomerate. 
Gluibes very approximate j spikelets often 20-40-flowered : 
Stem rather thick, terete, striate, at the top hardly trigonous . 2. C. effusus. 
Stem rather slender, at the top more or less trigonous . . 3. C. cruentus. 
1. Cyperus conglomeratus Rottb. Descr. et Ic. PI. p. 21, tab. 15, 
fig. 7 ; Dene. Ann. Sc. Nat. (1834), p. 15 ; Steud. Syn. PI. Glum. II, 
15 ; Boiss. FI. Or. Y, 369 (var. « in great part) ; Aschers. et 
Schweinf. 111. FI. d’Eg. p. 156 ; Hook. FI. Brit. Ind. YI, 602 ; Clarke 
in This.-Dyer FI. Trop. Afr. VIII, 324; 
Cyperus pun gens Boeck. Linnaea XXXV, 537 (except part of a 
elata) ; Clarke in Journ. Linn. Soc. XX T, 113. 
Cyperus proteinolepis var. pumila Boeck. Linnaea XXXV, 542. 
Cyperus Jeminicus Rottb. Descr. et Ic. Pl. p. 25, tab, 8, fig. 7 ; 
Kunth Enum. PI. II, 24 (not of Retz.). 
Cyperus areuatus Boeck. in Linnaea XXXV, 542. 
Description v — Glabrous, glaucous-green ; rhizome usually hardly 
any, sometimes elongate, inch in diameter ; roots of stout woolly 
fibres ; stems stout, 4-24 inches long, terete below, trigonous above 
thickened at the base, clothed with brown ovate acuminate scales. 
Leaves sometimes twice as long as the stem, sometimes only half as 
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