CLARKE THE CYPERACEAE OF COSTA RICA. 449 



6. Cyperus virens .Michx. FL 1: 28. 1803. 



Cyperus sordidus J. S. & C. B. Presl, ReL ILienk, 1: 171. 1828. 



DiSTUiB UTiON : Tlirougliuut warm and temperate America ; frequent in Central 



America. 



Costa RiCAN collections: Santa Maria, altitude 1,400 meters, Tomlnzli&Id'j San 



Marcos de Dota, altitude 1,200 meters, Tondiiz 2250; Cartage, altitude 1,400 meters, 



Biollcy 8990; Rio Tarrazu, Tonduz 7882. 



7. Cyperus surinamensis Rottb. Descr. & Ic. 35. pL Cuf. 5. 1773. 

 Distribution: Very common in the warmer parts of America. 



Costa Ricax collections: Diquis below Terraba, Tonduz 3578; Boca Banamij 

 Tonduz 9124; San Carlos, Pittier 2580. 



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8. Cyperus luzulae Retz. Obs. 4: 11. 1786. 

 Scirpus luzulae L. Sp, Pb 1: 75. 1753. 



Cyperus poly cephalus Lam* Tabl. Enryc. 1: 147, 1791. 



Marisais polycephalus Link, Hort. Berol. 1: 324. 1827. 



Distribution: In tropical America, common. 



Costa Rican collections: Polalcowshj 398; Buenos Aires, altitude 300 meterSj 

 Tonduz 4888; Terraba, altitude 250 meters, Tonduz 3580; Turrialba, altitude 500 

 meters, Tonduz 8275; El Corduncillal, PiWic/^ 3591; Rio Grande de Terraba, Tonduz 

 fi720; Boruca, rom/(/2 479I; Carrillo, altitude 300 meters, ron^//2 1185; Talamanca, 

 altitude 100 meters, Tonduz 8738, 8752, 9220; San Carlos, Tonduz 258G; Carrillo, Cooper 

 547, 584; San Miguel, BioUaj 74G4. 



9. Cyperus simplex IL B. K. Nov. Gen. &. Sp. 1: 207. J815. 

 Distribution: Frequent in South America; in Central America somewhat rare. 

 Costa Rican collection: Pond at Rancho Redondi), alt. 1,100 meters, Pittier 1138. 



10. Cyperus diflfususVahl, Eniiin. 3: 321. 180fk 



Cyperus tolacccmis II. B. K. Nov. Gen. & Sp. 1; 20(L ISb5. 

 DiSTRiBi tion; Throughout the warmer parts of lx)tli liemispheres. 

 Costa Rican collections: Pittier 3542; Vallee du General, Pittier 3377, 3379; 

 Boruca, altitude 450 meters, Tondit^; 3584, 4476; Old Harbor, Tonduz 3751; Talamanca, 



altitude 200 meters, Tonduz 9501; Alajuelita, altitude 1,000 meters, Tonduz 8848; 

 Turrialba, altitude 550 meters, Tonduz 9>'i^yS^\ GolfodeOsa, rom/u;i; 10102; Buenos Aires, 

 altitude 250 meters, Tonduz 3587, 3592, 3615 l>is, 



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



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

 gpikelets solitary, some in pairs or threes, 13 mm. long, 2 mm. wide, 14-flowercd; 

 glumes rather distant, ovate, but lanceolately produced; nut ellipsoidal, t)f about half 

 the length of the glume, black in maturity. -^Stems GO cm. long, slender, at ai>ex 

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

 obscurely 3-nerved. L^mbel 1 to 2 dm. in diameter, loose; bracts 5 or 6, the lowest 

 25 cm. long, 6 mm. wide. Glumes 1 to 2 mm. long, spreading obliquely, green and 

 scabrous on the keel. Stamens 3. Style hardly any; its brandies 3, long, very slen- 

 der^ tawny. — Allied to C, longifolius Poir., differing in that the glumes are not 



imbricated, but distant. 



Type LT. S. National Herbarium no. 818147. 



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



12. Cyperus sphacelatus Rottb. Descr. & Ic. 26. 1773. 

 Distribution: Africa and America, frequent in the warmer parts of both. 

 Costa Rican collection: San Carlos, ron(/;/z 2589. 



13. Cyperus compressus L. Sp. PI. cd. 2. 1: (>8. 1762. 



Distribution: "Widely dispersed throughout nearly all warmer parts of the earth. 



Costa Rican collections: Rio San Juan, Piiticr 2581; San Domingo de Osa, 

 Tonduz 10080. 



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