CLARKE — THE CYPERACEAE "l COSTA RICA. 449 



6. Cyperus virens Michx. I'l. 1: 28. L803. 



Cyperus sordidus J. S. & C. B. Presl, Rel. Baenk. 1: 171. L828. 



Distribution: Throughout warm and temperate America; frequent in Central 

 America. 



Costarica^ collections: Santa Maria, altitude L, 400 meters 1629; S 



Marcos de Dota, altitude 1,200 meters, Tonduz 2250; Cartago, altitude L ,400 mi 

 BioUey 8990; Rio Tarrazti, Tonduz 7882 



7. Cyperus surinamensis Elottb. Descr. & [c. 35. pL 6./. 5. L" 

 I >istbibi pion: Very common in the warmer parte of America. 



i\ Uii w collbctions: Diquia below Te'rraba, Ton tnana, 



Zbruru*9124; San Carlos, Pittier 2586. 



8. Cyperus luzulae Retz. Obs. 4: II. L786. 

 Scirpus luzulm L. Sp. PI. 1: 75. L753. 



Cyperus polycephalus Lam. Tabl. Encyc. 1: 117. L791. 



Mariscus polycephalus Link. II<>n. Berol. 1: 324. I s _'7. 



Distribi timn: iii tropical America, common. 



ota Rican .ections: Polakowshy 398; Buenoa Aires, altitude 300 m< 



Zowfttf 1888; Terraba, altitude 250 meters, Tonduz 3580; Turrialba, altitude ■ 



meters, Tonduz 8275; El Cordoncillal, Pittier 3591; Rio Grande de Terraba, rowrfu* 

 6720; Boruca, Tonduz 1791; Carrillo, altitude 300 meters, Tonduz L185; Talamanca 

 altitude LOOmeters, ZWuz 8738, 8752, 9220; San Carlos, ZWtw 2586; Carrillo, '^ r , 

 547, 584; San Miguel, Biolley 7464. 



9. Cyperus simplex II. B. K. Nov. Gen. & Sp. 1: 207. L815. 

 Distribution: Frequenl in South America; in Central America somewhal rare. 



■ i \ Rn w i mm E( tion: Pondal Rancho Redondo, alt. 1,400 meters, Pittier H38 

 ID. Cyperus diffusus Vald. Entun. 2: 321. L806. 

 Cyperus toluccensis B.. B. K. Nov. Gen. & Sp. 1: 206. L815. 

 Distribi tion : Throughout the warmer parts of both hemispheres. 



9ta Rican collections: Pittier 3542; Vallee du General, Pittier 3377, 

 Boruca, altitude 450 meters, Tonduz 3584, 4476; OldHarbor, Tonduz 3751; Talamanca, 

 altitude 200 meters, Tonduz 9501; Alajuelita, altitude L, 000 meters, ZYmdM* 8848 

 Turrialba, altitude 550 metere, TonduzSS59; GolfodeOsa, Tonduz L0102; BuenosAires, 

 altitude 250 meters, Fonrfi« 3587, 3592, 3615 bis. 



11. Cyperus chorisanthus C. B. Clarke, sp. nov. 



Rays of the umbel both primary and secondary slender fertile plant; many of the 

 spikelets solitary, some in pairs or threes, L3 nun. long, 2 nun. wide, 14-flowered; 

 glumes rather distant . ovate, but lanceolately produced; nui ellipsoidal, of about half 

 the length of the glume, black in maturity.- Stems 60 cm. long, slender, at apex 

 triquetrous and almost 3-winged. Leaves of the length of the stem, 1 cm. wide. 

 obscurely 3-nerved. Umbel 1 to 2 dm. in diameter. Loose; bracts 5 or 6, tin- lowesl 

 2-') cm. long. 6 mm. wide. Glume- 1 t<> 2 mm. Long, spreading obliquely, green and 

 scabrous on the keel. Stamens 3. Style hardly any: its branches :5. Long, very slen- 

 der, tawny.— Allied to C. longifolius Poir., differing in that the glumes are doI 

 imbricated, but distant. 



Type U. S. National Herbarium no. 818147. 



Costa Ric an collections: Forests of Boruca, altitude 460 meters, Tonduz 4475. 



12. Cyperus sphacelatus Rottb. Descr. & I< . 26. 177:'.. 

 DISTRIBUTION: Africa and America, frequent in the warmer part- of both. 



ota Rican collection: San Carlos, Tonduz 2 - 



13. Cyperus compressus L. Sp. PI. ed. 2. 1: 68. L762. 



Distribition: Widely dispersed throughout Dearly all warmer parts of the earth. 

 Ota Rican collection*: Rio San Juan, Pittier 2581; San Domingo de Osa, 

 Tondu: 10080. 



