Cyperus. | CLVI, CYPERACEX (CLARKE). 315. 
§ xvi. RorunDx.—Leafy. Glumes approximate. Large or medium-sized plants,. 
producing stolons or lateral shoots near the base. Wings of the rhachilla conspicuous, 
Spikelets scarcely attaining =}, 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. ibeensis. 
Stem at the base not oblong-thickened. 
Spikelets up to 14 in. long, 60-flowered, straw- 
coloured . ; : ‘i ‘ : . 95. C. locuples. 
Spikelets 1 in, long, ashy-brown 5 : - 98. C. congensis. 
Spikelets less than 1 in. long. 
Spikelets highly coloured ; glumes brown with 
green keel . 5 : : - 102. C. nuerensis. 
Spikelets pallid ; rhizome 4 in. thick, woody. 99. C. Heudelotii. 
Spikelets pallid, usually dull red spotted . 97. C. maculatus. 
Spikelets 7s in. broad, usually broader, linear, more or 
less lanceolate. 
Spikelets very pale straw-coloured, sometimes red- 
tinged. 
Spikelets very slightly compressed, rigid . - 96. C. natalensis, 
(5) Top) 
Spikelets distinctly compressed, loose c - 105. C. fenzelianus. 
Spikelets chestnut or chestnut-red. 
Spikes congested so that the umbel appears 
simple. 4 : : A : . 103. C. rigidifolius, 
Spikes loose; umbel manifestly compound . 100. C. rotundus, var. 
Spikelets ferruginous-reddish ; glumes with yellow 
or yellow-brown keel. 
Spikelets large, ;4, in. broad, in one dense com- 
pound head. é : : c . 104. C. Taylori. 
Spikelets either less than zp in. broad, or ina 
large open umbel. 
Anthers with an elongate triangular crest on 
the connective ; : . . 106. C, fissus. 
Anthers not crested ; tip of connective very 
short, triangular. es 
Nut 3-3 the length of the glume, oblong . 94. C. gracilinua, 
Nut less than 3 the length of the glume. 
Stem at the base decumbent, hardly 
bulbous : 4 . 101, C. longus. 
Stem at the base suberect, bulbous 
thickened. 
Rays of umbel either long stout or 
short ° - . 100. C. rotundus. 
Rays of umbel long slender js . 107. C. tuberosus. 
§ xvii, Exatratx.—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 falcate, yellow, early deciduous 112. C. tmmensus. 
Wings of rhachilla narrowly oblong, hyaline, per- 
sistent. 
