464 __ CONTKTBUTIONS FROM THK NATIONAL HEKBAKIUM. 



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7. Rynchospora macrochaeta SltnuL ill L(H'h]or/!V'rh(T. Am. Ceiitr. 5G. 1857. 

 RynchosporahoffninnniJioockl. Lhinaoa 37: n:^7. ]873. 



Noarly glal)roiis, moderatrly stout or almo.^t robust; pauu'U." of 3 corymbB, lliotie 

 loug-poduncled, dcnso, and paniculato; liypogynous bristl*^s 4 to fi, rigid, little sur- 

 passing the nut; style long, scarcely divided; nut ellii>soi(l. smooth, reticulate, 

 chestnut-colored, beak conicdinear, of the lungth of the nut. 



DiSTitiiiUTioN: New Gr(^uada, Colombia, Peru, and Bolivia; Costa llica. 



Costa Rican collecttons: Summit of the Volcan de Bar!)a, Hoffmann (J5; Barba, 

 altitude 2,750 meters, ToTuiaz 1051; Los Arcengoles Valley, Iseazu, altitude 2,000 

 meters, Pittier 239. 



8. Rynchospora vulcani Boeckb Linnav-a 37: G38. 1873. 

 Rynrhospora piniiri Boeckl. AUgcm. Bot. Zeitschr. 2: 109. 1890. 



Almost glabrous, tall; panicle of 3 or 4 long-peduncled pyramidal corymbs; hypogy- 

 nous bristles 4 or 5, twice as long as the nut; luit v(^ry small, subglobose, com])ress('<l, 

 smooth, some w^hat barred trausversidy, brown; beak atteniuite above a conical base, 

 shorter than tlu- nut. 



CoST,v Kk AN' collections: Summit of tlie Volcan de Barba, Ifofmann GO; Volcan 

 de Poas, altitude 2,(100 meters, Tondiiz 10758, 107()1; Potrero <lcl Altcj, altitude 2,450 

 meters, rittier 2990. 



Species related to R. macrncharfa Steud. very chj^uly; differing slightly by its 

 very small but broaden- nut. 



9. Rynchospora exiraia (Nees) lioockl. Linnaea 3 

 Spcrmodon eximius Xees in Seeman, Bot. Voy. Herald 222. 1845- 

 Pailocarya schkdvana Liebm. Dansk. Vid. Selsk. Skr. 2: GO. 1849. 

 Distribution: Mt^xico, Costa Rica. 



Costa Rican collkctionh 

 . Rynchospora robusta 



Tonduz 



DicJiromena rohnsfa Kunth. Enum. 2: 283. 1837. 



Pailocarija robusta Xees in Mart. Fl. Bras. 2^: II (J. 1842. 



Ralher robust, stolonifcn>us, si)ars<4y pul)csrHnU.; <orymbs axillary and Icrminal, 

 of many spikelets; mature spikclcts ovohl-ellipsoid, with [ to 8 nuts; bri.^ilcs none- 

 styh' tleeply bifid: nut broadly obovoid, transversely undulatedhieolate; beak ovoid, 

 of about the Icngtli of the nut. 



Dlsthibi tion: Guatemala, Costa Kica, South America. 



Costa Rican collkctiox: Cienaga de Agua Bu<-na. altitinh' 1,100 meters PilUrr 

 11023. 



Ryncho 



1 t>""0 



Ri/nchof^porajihjormis (;ris(4), Fl. Brit. West Ind. 57r;. lS(iJ, uoi Vald. 1800. 



Dichrov^ryia Jili/orw is Knnih, Bnmu. 2: 281. 1S37, synonyms excluded. 



Sprrviodonjih'/oniiis XccsinMart. Fl. Bras. 2': 118. 1843. 



DrsTKiBiTiox: Widely dispersed through tropical America. 



Costa Rican coLLiiCTioNs: Buenos Aires, altitudt* 300 meters. Pfffirr 10587. 

 12. Rynchospora clarkei KosCj sp. nov.« 



Stems 1 to 8 cm. long, nionocephalous, the head composed oi 1 or 2 spik(4i'ts; leaves 

 1 to 3 cm. long, linear; spikelets 2 to 3 mm. h.ng, maluring I lo 4 nuts: hypogynous 

 bristles none^ style branches 2, linear, rather long; nut 0.5 nun. long, obovoid, slightly 

 turgid, smooth, grayish-green; beak depressed. 



Type, sheet no, 818779, U. S. National TliMbarium. 



DiSTKiiiiTioN; Mexico (Jalisco. Pringle23l9, lypcM, Crtsta Rica. 



CosTA Ru:an cglf.kction: Buenos Aires, altitude 200 met<^rs. PiUier 10585. 



^ Tliis ppecies was given a name by Mr. Clarke, which is found (o be a Ixtmonym. 

 I have accordingly taken the liberty to name it for Mr, Clarke himself.— J. N. Rose. 



