( LARKE Till'. cVIM.i: \< i.\i 01 COSTA RI< \. I 57 



lAmnochloa calyptrata Liebm. Dansk. Vid. Selsk. Skr. 2: 56. L849 



Heleocharis calyptrata Steud. 8yn. PI. Glum. 2: 81. L855. 



Heleocharis rothiana Boeckl. Flora 43: 3. I860 



Heleocharis emarginata Klotzsch; Boeckl. Linnaea 36: 143. i x ~" 



Heleocharis costaricensis Boeckl. Allgem. Bot. Zeitsch. 2: 34. i- 



Heleocharis pvrpureo-vagincUa Boeckl. loc. cit. 



Distribi tion: Prom Mexico to Argentina; very common 



Costa Ri< w collections: Canae Gordas, altitude L,100 meters, Pittier 11026; 

 Buenos Aires, altitude 300 meters, Tondw i ss i: Boruca, altitude 450 meters, / 

 4637. 

 L2. Eleocharis pachystyla C. !'». Clarke in L T rb. Symb. A nt ill 2: 72. L900 



Sdrpus pachystylus C. Wright in Sauv. Fl. Cub. L74. L873. 



Distribi tion: Cuba, Venezuela, Trinidad, Guiana, Pernambuco, « osta Rica. 



Costa Rican collection: Canas Gordas, altitude L, 100 meters, Pittier L1025. 

 13. Eleocharis geniculata R. Br. Prod. Fl. Nov. Eoll. 224. 1810. 

 pus geniculatus L. Sp. PI. ed. 2. 1: 71. L762, in part. 



Eleocharis constricta Schult. in Etoem. & Schult. Syst. Mam. 2: 87. L824. 



lAmnodUoa geniculata Nees in Mart. Fl. Bras. 21: 99. 1842. 



Distribution: From Mexico to Uruguay, very common. 



Costa Ri< w collections: Boruca, altitude l"><> meters, Tonduz 3843, 1636 

 Galiente, altitude L,300 in.-i.-r~. Pittier L07; Rio Tufs, altitude 600 meters, Tonduz 

 L1390; Turrialba, altitude 600 meters, Pittier L4254, Tonduz 8300; La Palm... altitude 

 L,500 meters, Pittier L0187; Talamanca, altitude LOO meters, Tonduz 9219; Desampa- 

 rados, .BtoJky 3465, Fonditf L501; CarrQlo, altitude 300 meters, /'///;,••. L184. 



ELEOCHARI8 SPECIES TO BE LOOKED FOB l\ COSTA RICA. 



Eleocharis Montana Koem. & Schult. Syst. 2: L53. 1817. 



Scirjms montanus 11. B. K. Nov. Gen. & Sp. 1: 226. 1815. 



lAmnochloa truncaia Liebm. Dansk. Vid. Selsk. Ski-. 2: 56. 1S49. 



Distribution: Very common in Central America and occurring almosl throughout 

 tin- warmer parts of America. 



Related to E. sulcata Nees, bul differing in its longer, stouter rhizome and yellow 

 nut. as well as in minor particulars. 



7. FIMBRISTYLIS Vahl. 



Glumes several or many, imbricated all around or in section Abilgaardia the lower 

 somewhat 2-ranked; 1 to 3 lower vacant; several lower flowers bisexual and perfecting 

 nuts; hypogynous bristles none; stamens 3 to 1. anterior, style branches, 3 or 2, 

 linear: style base separated from the nut by a constriction or a line and deciduous 

 with it: nut trigonous or plano-convex, sessile or substipitate. Stolons none. Stems 

 naked, i. e., nodes and leaves all near the base <>i" the stem. I nflorescence umbellate, 

 or monocephalous, or of a single spike. 



Species L30, dispersed in warm countries everywhere, especially in the Old World; 

 unknown in either mountainous or cold regions. 



key to rni. SPE< II s. 



Style branches 2. Dichelostylis 



Nut conspicuously 5 to 9-costate on both faces 1. F. rfif>hijll<t. 



Nut rather obscurely reticulate, nol costate lengthwise 



Spikelete ellipsoidal, obt usish 2. /•'. castanea. 



Spikelets subcylindric, narrowed at apex :\. F, spadicca. 



