Cypen/s.] Cyperacece. 3$ 



Var. (3, amoenus, Clarke in Jonm. Linn. Soc. xxi. 187 (1 

 amoenus, Keen. mss. C. venustus, Thw. Enum. 432. C. P. 3788 



Umbels more compound, rays more numerous, up to 7 in. 

 long, spikes with more crowded suberect spikelets, rhachilla 

 not, or obscurely, winged. 



Sides of ponds and standing water ; common. Fl. Dec, &c. 



All tropical and warm countries. 



Mr. Clarke informs me that the var. amoenus was not taken up in 

 Fl. B. Ind., because he found it to be inseparable from ordinary forms of 

 exaltatus. Dr. Trimen has, however, retained it in his list prepared for 

 this work, and I therefore enter it here, whilst so far agreeing with 

 Mr. Clarke in his opinion, that I think it hardly deserves recognition. 



30. C. tuberosus, Rottb. Descr. et Ic. 28 (1773). 



C. Betzii, Nees ; Thw. Enum. 343. C. rotundus, vax.ftrocertda. Clarke 

 in Journ. Linn/'Soc. xxi. 172. Trim. Syst. Cat. 100. C. P. 3750. 

 Fl. B. Ind. vi. 616. Rottb. 1. c. t. 7, f. 1 (not good). 



Perennial ; rootstock creeping, woody, stoloniferous, stolons 

 not tuberiferous, root-fibres filiform, covered with branching 

 root-hairs ; stem 2-4 ft., slender, trigonous, base tuberous ; 1. 

 mostly radical, shorter than the stem, slender, up to ^ in. 

 broad, margins smooth ; umbel compound, 4-8 in. diam., rays 

 few or many, slender, spreading, up to 6 in. long, and secondary 

 rays terminating in 6-8 approximate, spreading, pale spikelets; 

 bracts 3-4, longest 1-2 ft., margins smooth; spikelets sessile, 

 J- § by T V in. linear, acuminate, compressed but rather turgid 

 along the middle line, 16-24-fld., shining, pale red-brown ; 

 glumes large, loosely imbricate, suberect, ^-J in. long, ovate- 

 lanceolate, acuminate, keeled, hyaline with a narrow tri- 

 angular sub-3-veined centre; rhachilla slender, wings oblong; 

 stam. 3, anth. very narrow, muticous; nut ^ the length of the 

 glume, broadly obovoid, trigonous, umbonate, greyish-black; 

 style much longer than the nut, stigmas 3, capillary. 



Wet places in the low country ; rare. ' Central Prov.' (Thwaites). 

 Var. /3, in the dry region. Dimbula ; near Hambantota. Fl. Dec- 

 March. 



Also in India, Mauritius, Australia. 



Trimen has var. /3, tenuiftorus (C. tenuiflorus) Rottb., Trim. Cat. 100) 

 of which h,e says, ' 1 should feel inclined to consider var. (3 a distinct 

 species, but it is not reckoned even a variety in Fl. B fc Ind. 5 According 

 to the very poor specimens of this in Herb. Peraden., I am inclined to 

 refer it to C. rotimdus. 



31. C. compressus, L. Sp. PL 68 (1753). 

 'I hw. Enum. 342. C. P. 812. 



Fl. B. Ind. vi. 605. Rottb. Descr. et Ic. t. 9, f. 3. 



A tufted annual, stems 4—16 in., erect, slender, trigonous, 

 angles rounded, smooth; 1. longer or shorter than the stem, 



PART V. D 



