13S. CYPEBACE.^. [1. Cyperus. 



3. Glumes somewhat loug-er than broad, •02--05''. 

 Nuts symmetricallj' 3-gonous:— 



H. 2-8". Gl. -Ol-'OS" mucronulate. Nut obpyra- 



midal "02" 6. amabilis. 



H. 2-6". Spkts. chestnut-cold. Gl. ■04--05" with 

 awnlet about |th blade. Nut linear-oblong- 

 •03" 7. castaneng. 



H. 1-3". Spkts. ferruginous. Gl. •03--0i'' with . 

 awnlet recurved, \ to as long as blade. Nut 



narrowly obovoid "02" s. nigpidatng, 



B. Spikelets spicate rather than clustered but rhachis 



short (long in iria). Spp. 9-11 : — 



1. y pikelets very short i"2-"4" long only) in contracted 



spikes resembling heads, rhachis on fall of spkts. 

 marked with spiral disciform scars : — 

 Gl. •05--06" long with recurved awnlets as long as 



blade 9. urhtatus. 



2. Spikelets elongate, not deciduous nor leaving 



closely scarred rhachis :— 

 Gl. vei-y short and broad, •0J;--05" truncate. Spikes 



long 10. iria, 



Gl. •13-15" acute or mucronate. Spikes short . 11. compregsiis. 

 Perennials with thick rootstocks or thick or slender 

 rhizomes. Glumes mostly over '07" (exc. in some 

 Nos. 2-i-28). Spp. 12-end :— 



A. Spikelets clustered, not spicate. Spp. 12-15: — 



1. Spikelets in simple heads or reduced to a single 



spkt, : — 

 a. Spkts. much compressed, white or cinna- 

 momeous : — 

 Spkts. '^-l" long. Median gl. ■15-"17". Nut 



•06--08" 12. nivens. 



Spkts. -2" long, rarely •3--5" in a dense head 

 like a Kyllinga. Gl. "Oo-'OS". Nut "03" . . 13. leucocephalus. 

 h, Spkts. not much compressed. Gl. "18". Sand 



plants li. arenarius. 



2. Spkts. 3-9 in a cluster, clusters in compound 



umbels : — 

 Gl. •06-^07" long. Style very short. Nut broadly 



ell '.15. diffums. 



B. Spikelets distinctly spicate. Spikes in simple or 



compound umbels. Spp. 16-eiid : — 

 1. Rhachilla with usuallj' 2 wings at each internode 

 parallel to median plane of flower, free from 

 glume or 0. Robust herbs. Spp. 16-28 : — 

 a. Nut oblong or narrowly ellipsoid. Inflorescence 

 usually more or less feathery with spikelets 

 of unequal length and slender rhachilla, not 

 conspicuously shorter than the glabrous spikes 

 (open toexceptions but cp. next section). Spp. 

 16-23 :— 

 i. L. long- (often as long as stem). Bracts long. 

 "Wings of rhachilla narrow and hj-aline 

 (usually). Gl. often loosely imbricate :— 

 t Gl. •07-^l" :— 



Spkts. ^7-1" long, nodding or spreading on 

 the lax spike. Gl. distant, truncate, 



reddish IG. digtans. 



Spkts. erect, at least in fruit. Gl. mucronu- 

 late 17. nuta-ns. 



Spikes more densely fascicled, usually 



grey var. eleicsinoides. 



M Gl. "18" long, loosely imbricate as in diitfaus 18, Thumgoni. 

 ii. L. few or short (up to 6") or 0. Bracts 

 short. Wings of rhachilla variable in 

 breadth. Gl. closely imbricate : — 



891 



