CYPEEACE^. 105 



bracts long. Rhachilla of spikelets winged. Glumes closely imbricate. 

 Stem at the base nodosely thickened suddenly constricted into a 



long rhizome C. rotundas. 



Rhizome woody long-creeping, stem at top trigonous at base 



nodose C. stolonifer. 



Stolons elongate rather slender, stem tall at base bulbose woody ; 



C. tuberosus. 



Tall. Stolons 0. Leaves and bracts long. Umbel large compound* 

 spikes and spikelets many. Rhachilla of spikelets conspicuously 

 winged. Anthers apiculate, not rarely crested, style (with its 3 

 branches) small. Nut small, ashy black. 



Spikes digitate scarcely peduncled long-cylindric dense, spikelets 

 linear 12-30-fld., glumes closely imbricate, wings of 

 rhachilla oblong persistent, anthers short-oblong not crested 



C. radiatus. 



Spikes (some) peduncled long cylindric, spikelets very many 

 linear 8-20-fld., glumes closely imbricate, wings of rhachilla 

 oblong persistent, anthers oblong not crested . . . . C. exaltatus. 

 Umbel large compound, rays divaricate, spikes cylindric, spikelets 

 very many linear 6 40-fld., wings of rhachilla lanceolate 

 yellow soon deciduous, anthers linear-oblong scarcely crested? 



nut oblong-obovoid % length of glume C. digitatus. 



Cyperus procerus ROTTB. - C. B. CLARKE in HOOK f. Fl. Brit. Ind. 

 VI. p. 610 ; HEMSL. Ind. Fl. Sin. III. p. 215. 

 HAB. Hokuto, leg. T. SOMA, Nov. 1914. 



Cyperus dense-spicatus HAYATA sp. nov. (Fig. 23-a-d). Caulis haud 

 ram os us circ. 1 m. altus acute triqueter glaber erectus. Folia pauca linearia 

 cum vaginis 60 cm. longa, laminis 7 mm. latis apice acuminatis margine 

 integris haud scabris ; foliis caulinis nullis, bracteis basi inflorescentise insitis 

 foliiformibus 4050 cm. longis 6 mm. latis inflorescentiam in longitudine multo 

 exceedentibus glabris patentissimis. Inflorescentia duplicato-umbellata sessilis 

 10 cm. longa 15 cm. in diametro, radiis circ. 10 patentibus 10 cm. longis 

 rectis simplicibus vel apice umbelluliferis, umbellulis sessilibus circ. 5-radiatis, 



