CLARKE — THE CYPERACEAE "l COSTA RI< \. 165 



L3. Rynchospora cephalotes L.) Yalil. Knum. 2: 237. \^ ,u > 

 Scirpus cephalotes I. Sp. PI. ed. 2. 1: 76. L762. 

 Schoenus cephalotes Etottb. Descr. & [c. 61. />/. 20. 177:'.. 



I ksTRiBi tion: I lentral America, and in South America as far as Chile; common. 

 Costa Rican collbctions: Buenos Aires, altitude 300 meters Tondm 3644, i vN > 



II. Rynchospora glauca Yahl. Enum. 2: 233. L80G 

 Schoenus gracilis Sw. Prod. Veg. [nd. Occ. L9 1788, in Lesser part. 

 Rynchospora gracilis Vahl, Enum. 2: 234. L806 

 Rynchospora pung ens Liebm. Dansk. Vid. Selskr. Skr. 2: 65 L849 

 Distribution: Almosl all warm countries. 

 Costa Kkw collections: Boruca, Tondui 3582; Buenos Vires, altitude 300 



meters. Tondm 1883 bis; Paramos del Abejonal, iltitude 2,900 meters, Tondm 7863 



L5. Rynchospora schaffneri I >oeckl. Linnaea 37: 575. I s 7:'. 



Rynchospora durandiana Boeckl. Allgem. I!"!. Zeitschr. 2: 94. L896. 



Glabrous, panicle narrow, composed of spiciform corymbs; Bpikeleta l mm. l"U'_ r . 

 chestnut-colored, ovoid-lanceolate, perfecting but one nut; Btyle deeply bifid; nul 

 obovoid-ellipsoid; beak hardly hall" as Long as the nui. pyramidal, scabrous; hypogy- 

 nous bristles 6, ab »u1 equaling the aut. 



Distribution: Mexico, Costa Rica. 



Costa Kkan collections: El Copey, altitude 2,600 meters, Tondm L4863; Portillo 

 del Poas, altitude 2,500 meters, Pittier 327. 



16. Rynchospora marisculus Xees. Linnaea 9: 297. L834. 

 Rynchospora jubata Liebm. Dansk. Vid. Selsk. Skr. 2: 66. L849. 

 Distribution: Mexico to Paraguay; frequent. 

 Costa Kuan collection: Cienaga de Agua Buena, altitude I . LOO meters, Pittier 



11022. 



14. SCLERIA Berg. 



Flowers unisexual, axillary; pistillate glumes open. i. e., not with united margins 

 and utriculiform; hypogynous bristles none; nut bony, globose, more or less trig- 

 onous or obovoid, white, lead-colored, or purplish, inserted on a gynophore, which is 

 often dilated into a 3-lobed disk, sometimes cup-like. — Spikelets few-flowered, some: 

 times androgynous with a single basal fertile flower and several staminate ones above it ; 

 sometimes unisexual, either staminate and many-flowered, or pistillate with but one 

 fertile flower, but with several rudiments above it, or these almost obsolete. Leaves 

 always obvious. 



Species ISO, dispersed all around the world within and near the Tropics, especially 

 in the humid regions. 



KEY TO THE SPECIES. 



Spikelets not all unisexual, i. e., some androgynous with fertile spikes. 

 Roots fibrous: plants slender. 



[nflorescence having the appearance of ;i - i n l: 1 < • -pike i x. distans. 



Inflorescence Loosely panicled 2. S. liebmannii. 



Plants less slender; with horizontal rhizome. 



Inflorescence like a single spike •"'. S. hirtclla. 



[nflorescence Loosely panicled 1. S. lithos pernio. 



Spikelets all unisexual; plants rather robust. 



Roots fibrous i Tessell \ tab i 5. S. lacu ■ 



Margin of disk not ciliate; perennials Ei 3* leki \ 



Stems branched and straggling; Ligule elongated U S ejlexa. 



