450 CONTRIBUTIONS FROM TITK NATTONAT. HERBARTUM. 



Ehochans srhwea R. Br. PhkI. FL Xnv. Hr)]l, 225. 1810, iiol. R. Hr. op. rit. 224. 



KhogemiH nipllafus Noes, Limiaoa 9: 294. 18,SL 



Dti^trtbutiom: Warmor n^jjions of huth liomispluMVP, oonimmi, 



Costa Ricax ('Olle(ti()ns: Talanumca, altitiido 100 motors, Tondft: ^2}i\, 



fi. Eleocharis nodulosa Scliult. in Room. & Sdiult. Syjst. Mant. 2: .S7, 1824. 



Scirpits nothdoms Roth, Nov. PI. Sp. Ind. Or. 29. 1821. 



Elcogcmis nodulosus Noes ia Mart. Fl. Bras. 2^: 104, 1842. 



Dtstiubltion: From Missouri to Toxaaaml Uniguay, very cominoii. 



Costa Rican collections:^ Ilofmann 024; [Toridaz] S845; El Tablazo. altitude 

 1,800 meters, Tonduz 791G, 7917. 



7. Eleocharis acicularis R. Br. Prod. Fl. Nov. IIoll. 224. 1810. 

 Scirpns acknlaris L. Sp. PL 1: 48. 1753. 



Chuiiocypcrus polymor plats Noes, Linnat^a 9: 289. 1834, in pai't. 

 DiyTiiiBUTiox: In tropical and warm toinperalc roj^ion;^ of botli Old World and 

 NeWj very common. 



Costa Rican collections: Pods, altitude 2.500 meterp, Pittifr 2\)7H, Tondi(:M)7iV2, 

 10704. 



8. Eleochaiis chaetaria^ Room. & Sclmlt. Syst. 2: 154. 1817. 

 Snrp^^s chaeiarius Rprong. Syst 1: 203. 1825. 



Cyperus selaceus^etz. Obs. 5: 10. 1779-91. 



Eleocharis setacca R. Br. Prod. Fl. Nov. Holl. 224. 1810, not R. Br. op, rit. 225. 



Chartocy perils niveus Liebm. Dansk. Yid. Selskr. Skr. 2: 54. 1849. 



Chiuiocy perns rugulosus Nees, Bonplandia 3; 80. 1855. 



Ilekocharis idjlora Boeckl. Flora 63: 437. 1880. 



DisTiaBUTioNi In all tropical and temperate parts of the worLl, very common, 



Costa Rican collections: Polalowshj 404; Trc^s Riop, Pittier 4338; La Palma, 

 altitude 1,500 meter?!, rUiier 311, 676, Tonduz 12640; Turrialba, altitude 500 meters, 

 Tonduz 8265; Rio Tuis, altitude 600 meters, Tonduz 8184, 11253; Golfo de Osa, Ton- 

 t/i^- 9938; Buenos Airop, PiVnVr35S6, Tonduz A^%S^\ El Rudeo de Paquita, altitude 900 

 meters, Tonduz 1619. 



9. Eleocharis minima Knnth, Euum. 2: 139. 1837, 

 Chaetocyperus mceolalus Liebm. Dan^k. Vid. Sel:sk. Ski\ 2: 55. 1849. 

 Distribution: Florida and Mexico to Rio de Janeiro, 



Costa Rican collection: Canas Gorda^j, altitude 1,100 meters, Pittier 10951. 



10. Eleocharis durandii Boeckl. Allgom. Bot. Zoitschr. 2: 34. 1896. 



Tufted, ^toms 10 to 30 cm. long, slender, sharply quadrangular; spikelet 4 lo 7 mm. 

 long, ellipsoidal, obtuse, dense; style 3-fid; bristles 6, about equaling the nut, whitt^; 

 nut small, trigonous, smooth, white, not much narrowed at sunnnit, subtruncate, 

 style base pjTamidal, tawny. — Rhi/ome none (or according to Boeckolor occasion- 

 ally long and slender). Stems strict; sht^ath firm at sunnnit, on otu^ sich^ produc(Hl 

 lanceolately. Bristles retrorsely scabrous. Style short, its l)ranch(*R 3, hmg. As to 

 its nut and bristles, altogeth<T recalling E. microearpa Torr.; the species differs from 

 that, perhaps not suOicienlly, by its rather men* robust stems. 



Costa Rican collections: Buenos Air<'s, altitu<le 300 motors, Tonduz 4887. 



11. Eleocharis sulcata Nees, Linnaea 9: 294. 1834. 

 Sdrpas suhalus Roili, Nov. PL Rp. IniL Or, 30. 1821. 

 Fimhrialylks sulcata Roem. & Scliult. Syst. Mant. 2: 52. 1824. 

 Scirpidiutn sulcatum Neen in Mi\r\. Fl. Bras. 2': 98. 1843. 



a The older specific nann^ sefncea is availahlo for this plant. Robtul, Brown refers 

 Cyperussetaceus oi Rel/.ius and Willdoiiow to tliis gonus, but fails to form llu' l)ino- 



miaL — Editou. 



