r r ■ n —^ \ -■ ^" -j i i i ui 



' ■ 4 



■•■h-- 



CLAEKE THE CYPERACEAE OF COSTA KIOA. 465 



13. Rynchospora cephalotes (^L.) Vahl, Enum. 2: 237. 18(Hk 

 Scirpus cephalotes L, Sp. PL ed. 2. 1: 76. 1762. 



Schoenus cephalotes Tlottb. Dcricr. & Ic. 01. pL 20, 1773, 



Distrtbution: Central America, and in South Aiuorica as far as Chile; common. 



Costa Recan collections: Buenos Airori, altitude 300 meters, Tondaz 3G44, 4885. 



14. Rynchospora glauca Vuhlj Enum. 2: 233. 180<). 



Schoenus gracilis S\v. Prod. Vcg. Ind. Oeo. 19. 1788, in lesser part. 



Rijnchospora gracilis Valil, Enum. 2: 23L 1806. 



Rynchospora piingens Liebm. Dansk. Vid. Sel^kr. Skr. 2: (>5. 1849. 



Distribution: Almost all warm counLries. 



Costa Rican collections: Boruca, Tondaz 3582; Buenos Aires, altitude 300 

 meters, Tonduz 4883 his; Paramos del Ahejonal. altitude 2,900 meters, Tondaz 78G3* 



15. Rynchospora schaflfneri Boeckl. Linnaea 37: 575. 1873. 

 Rynchospora durandiana ^oockl. AUgcm. Hot. Zeitsehr. 2: 94. 1896. 



Glabrous, panicle narrow, composed of spieiform corymbs; spikelets 4 mm. long, 

 chestniit-colored, ovoid-lanceolate, perfecting l)ut one nut; style deeply biiid; nut 

 obovoid-(dlipsoid; beak hardly half as long as the nut, pyramidal, scabrous; hypogy- 



-■ i 



nous bristles 6, about equaling the imi. 

 Distribution: Mexico, Costa Rica. 

 Costa Rican collections: 1^]1 Copey, altitude 2,(i00 meters, Tonrfu^ 14863; Portillo 



del Poa.s, altitude 2,500 meters, Pittier 327. 



16. Rynchospora niarlsculus NeeSj liinnaea 9; 297. 1834. 

 Rgm-hospora jubata Liebm. Dansk. Vid. Selsk. Skr. 2; 66. 1819. 

 Distribution: Mexico to Para^may; i'requcmt. 



Costa Rican collection: Cienaga de Agua Buena, altitudo 1,100 meters, P^mcr 



11022. 



14. SCLERIA iicrg. 



Flowers unisexual, axillary; pistillate glum(\s open, i. e., not wilh united margins 

 and utriculiform; hypogynous l^ristles none; nut bony, globose, more or less trig- 

 onous or obovoid, white, lead-colored, or purplish, inserKnl on a gynophon% which is 

 often dUatcd into a 3-lol)ed disk, somdimos cup-like.— Spik(4els few-flowered, some- 

 times androgynous with a single basal fert ilc flower and several siaminatc; ones above it ; 

 sometimes unisexual, either staminate and many-flow(T(vl, or pistillate with but one 

 fertile flowx^r, but with several rudiments alxive it, or these almost obsolete. Leaves 



always obvious. 



Species 180, dispersed all around tlu' world within and near the Tropics, especially 



in the humid regions. 



KKV TO TUE SI'ECIES. 



Spikelets not all unisexual, i. c, s<Mn(^ androgynous with fertile spikes. 



Roots fibrous: plants slend(M-. 



Inflorescence having the appeaiance of a single spike. . . I. S. disians. 

 Inflorescence loosely panicled - 2. S. Ikhmannii. 



Plants less slender; with horizontal rhizonu^ 



Inflorescence like a single spike 3. S. hirlella. 



Inflorescence loosely panicled 4. S, lithosperma. 



Spikelets all unisexual; plants rather robust. 



Roots fil>rous (Tessellatae) - 5. ^S'. larunfrls. 



Margin of disk mU ciliate; perennials ( Ei sclkiu \ i. 



Stems branched and straggling; ligule elongated 6. ^"S, rcjiexa. 



•< 



