Cypei^us.] CLVi. CYPERACEiE (clarke). ;^15 



§ xvi. R0TUND.1:. — Leafy, Glumes approximate. Large or me Jium- sized plants, 

 producing stolons or lateral slioots near the base. Wings of the rhacliilla conspicuous! 

 Spikelets scarcely attaining Jj in. in breadth, exactly 

 linear, i.e. of the same width, nearly their whole 

 length with parallel sides. 

 Stem at the base oblong- thickened by leaf -sheaths 108. C. ibeens s. 

 Stem at the base not oblong- thickened. 



Spikelets up to li in. long, 60-fiowered, straw- 

 coloured 95. C. loruples. 



Spikelets 1 in. long, ashy brown . . .98, C. congensis. 



Spikelets less than 1 in. long. 



Spikelets highly coloured ; glumes brown with 



green keel 102. C. nuerensis. 



Spikelets pallid ; rhizome ^ in. thick, woody . 99. C. Heudelotii. 

 Spikelets pallid, usually dull red spotted . 97, C. viaculatus. 



Spikelets y^^ in. broad, usually broader, line.ir, more or 

 less lanceolate. 

 Spikelets very pale straw-coloured, sometimes red- 

 tinged. 

 Spikelets very slightly compressed, rigid , . 96. C. natalemis. 

 Spikelets distinctly compressed', loose . . 105. C.fenzelinnns. 



Spikelets cbestnut or chestnut-red. 



Spikes congested so that the umbel appea; s 



simple . . , . , , . 103, C. rigidif otitis. 



Spikes loose; umbel manifestly compound . 100. C. rotund ks, \\r. 



Spikele'-s ferruginous- reddish ; glumes with yellow 

 or yellow-brown keel. 

 Spikelets large, -^ in. broad, in one dense com- 

 pound head ...... 104. C. Taglori. 



Spikelets either less than y^^j in. broad, or in a 

 large open umbel. 

 Anthers with an elongate triangular crest on 



the connective . . , , , 106. C.fissvs. 



Anthers not crested ; tip of connective very 

 short, triangular. 

 Nut 4-| the length of the glume, oblong . 94, C. gracilinux. 

 Nut less than 4 the length of the glume. 

 Stem at the base decumbent, hardly 



bulbous , . . . . 101, C. longus. 



Stem at the base suberect, bulbous 

 thickened. 

 Rays of umbel either long stout or 



short 100, C, rotundun. 



Rays of umbel long slepder . .107. C. tuberosus. 



§xvii. ExALTAT^, — Leaves and bracts long. Tall annuals without stolons, some- 

 times producing in autumn short lateral shoots, and flowering a second season. Umbel 

 large, compound. Rhachilla of spikelets conspicuously winged. Style (with its 3 

 branches) small. Nut small. 



Spikelets linear, much compressed. Wings of the 

 rhachilla persistent, except in C. immensus. 

 Wings of rhachilla fah ate, yellow, early deciduous 112. C.immensus. 

 Wings of rhachilla narrowly oblong, hyaline, per- 

 sistent. 



