450 CONTRIBUTIONS FROM THE NATIONAL HEREA1UU.M. 



14. Cyperus esculentiis L. Sp. PL 1:45. 1753. 



Cy perns fid vcsccns Liebm. Dansk. Vid. Selsk. Skr, 2: 22. 1849. 



Distribution: Warmer regions of the whole world. 



Costa Rtcan collections: Puerto Limon, rittier 4214; Talamanca, Tonduz 8739. 



15. Cyperus radiatus Vahl, Eiium. 2: 3fi9. ISOfi. 



Cyperus campestns Schrad.; Nces, Mart. Fl. Eras. 2^: 35. 1842. 

 Distribution: Very coninion in warm regions of the Old World; soniewliai rare in 

 those of the New World. 



Costa Rican collection: San Carlos, Tonduz 2b^2. 



[Cyperus macroletts Boeckl. in Kneuck. Allgcm. Bot. Zeitsch. 1: 226.1895, 



represented hyTovAliiZ no. 8185, appears (o have been overlooked by Mr. Clarke, 

 Editor.] 



Sl'ECIES op CVI'ERIIS TO JMO L()OKP:i> FOR IN COSTA RU'A. 



Cyfkrus heslerioij>ks H. 15. K. Nov. Gen. & Sp. 1: 209. 1815. 



Distribution: Common in Central America; in South Amorioa rare. 



Differs from C. tcnerrmius Presl, in that its .stems are ligneous at 1)a.^e, nodose- 

 thickened, and fasdcled on a very .short roolstock; altso in some other points. 



Cyperus humilis Kunth, Enum. 2: 23. J837. 



Distribution: In Central America, wliere it is of frequent occurrence. 



Differs from C. Icncrrimus Presb among other thingt^, in that the glumes are neither 

 cymbiform nor curved. 



Cyperus amarjlis Vahl, Knum. 2: 318. 1800. 



Cyperus aureus 11. P. K. Nov. Gen. & Sp. 1: 205. 1815, not Georgi. 1802. 



Cyperus glarcosus Liebm. Dausk. Vid. Selsk. Skr. 2: 10. 1850. 



Distribution: Throughout almost all warm countries; frequent in Central America. 



Difiers most notably from C, unnnaius Poir. in that the nuicro of the glume is not 

 uncinate, but straight, short, or even wanting 



Cyperus ochraceus Vahl, Enum. 2: 325. 180G. ^ 



Distribution: Central America, common. 



Differs from C. sitrinamensis Rottb. among other points in that its glume is slightly 

 inflated rather than compressed; from C. virens Michx. in that the trigonous apex of 

 its stem is nearly smooth. 



Cyperus elk(;ans L. Sp. PL ed. 2. 1: 68. 17G2. 



Cyperus viscosiis Sw. Prod. Veg. Ind. Occ. 20. 1788. 



Distribution: Common in the West Indies; frequent in other parts of tropical 

 America. 



Differs from its allies in that its stems and foliage^ are usually minutely viscid- 

 pubescent, 



Cyperus prolixus H. B. K. Nov. Gen. & Sp. 1: 20C. 1815. 



Comostem}im schottii ^ee'^^ Linnaea 9: 283. 1834. 



Cyperus ainplissimus Steud. Syn. PL Glum. 2: 316. 1855. 



Distribution: Warmer parts of America, frequent. 



A showy species, allied to C. disiam L. f. Stem 1 to 1.5 meters long Leaves 

 50 to 100 cm. long, 1 to 2 cm. wide. Umbel 40 to 60 cm, in diameter and copious* 

 Spikolets 15 mm. long^ 10 to IB; flowered, pale or brick-reddish. 



Cyperus articulatus L. Sp. PL 1: 44. 1753. 



Distribution: Almost all warm regions throughout the world. 



Stems stout, 10 to 20 cm. long, terete, false-septate. Bracts of the umbel almost 

 none. 



