i- ^ 



CLAKKK — THE CYPIviLVrEAE OF COSTA RTCA. 4()1 



infu l-seodf'd jnint??, Typf far removed frmn (In* FjicypenuTiie by its cl<»soly jointed 

 ciiliu nnd its liyi^ogynoiis bristlo^^. 

 Spt'(i<*sl, Aiiirriraii. 



1. Dulichiuni arundinaceiina (L.) Tirilimi, I'.iilL Tnrr. Hul) 21: 29. 1804.^ 



(Jypinis anindifiaans L. Sp. PL 1; 44. 1751^. , 



Schoenaa i>[}alhacca6 li. Sp, PL od, 2, 1: 0;-!. 17()2. 



CyperuHferruylneus L. Sp. PL ed. 2. 1: C3. 17(12^ as citation. 



Ihtlichhiin spathaceujn Tj. 0. Rich, in Pe^rs. Syn. 1: G5. 1805. 



Scirpus spathaceus ^livlix. FL 1: 'A2. J 802. 



Stems 40 to 100 cm. long ,with 20 to 40 nodes; Leaves 10 cm. long, 6 mm. wide; pan- 

 icle 10 to 30 cm. long; lower bracts leaf-liko. distant from each oIIkt by about 1 to 5 cm. 

 spikelets 2 cm. long, 3 mm. in diameter, subt4'rele: liypogynou^s bristles rather rigifl, 



surpassing tlio nut. 



Distritution: From Panada and Or(^gon to Florida and California, frequent; 



Costa Kica. 



Costa Rican collections: Loinas d(^l Silencio, Diqufs Valley, altitude 000 meters, 

 PiUier 1203: 



12. DICHROMENA Vahl. 



■ 



Glumes very many, closely compacted in many spirals; 3 or more of the lowest 

 vacant, 1 to 3 next above these bis(»xuaL perfecting nuts; several of the uj)permost 

 staminate only and inf(»rtile; hypogynous l)risth^s none; stamens 3 or 2, anterior; 

 stylo linear, its branclu^s 2, linear, longer than tlie uiulividtHl part; nut sessile^ obovoid 

 or orbicular, compressed, crcjwned witli ])ynunidal, d(^pressed or conical persistent 

 style-base. — Plants ratlu^r slend(T, the leaves narrow. Stems naked^ monocephahuis. 

 Spikelets whitish, capitate. Rracts exci-eding tlu^ inllon^scence, narrow^ dilated and 



whitish at base. 



Species 13, peculiar to tropic an<l subiro])ie Ameriea. 



Spikelets white, subspic^ately capitate 1. D. eiliata. 



Spikelets cinnamon-color, 1 to 5, sessih^ 2. J), radimm. 



r 



1. Dichromena eiliata YahL Enuni. 2: 240. U^OO. 

 Dichromena nervosa Yahl, Enuin. 2: 241. ISOfi. in part. 

 Sdiomus glohosus H. P. K. Nov. Gen. tt S]*. 1: 229. 1815, 

 i>Tc/?ro?77^na 2^?/ra NeeSj liinnaea 9 ; 291. 1834. 

 Rynchospora nervosa Boeckl. Linna(^a 37: 529. 1873, tlu* synonym Dichromena pvl- 



chcUa Kunth excluded. 



DiSTRiBLTiox: Central America and tropical South America. 



Costa Rica'x collections: Iloffmann iM))^] M'urrialba, Tovrhtz S22^; San Jose, alti- 

 tude 1,100 meters, /^U/(cr 421(j, Tondnz 432, 1232; Guana<'aste, Toridffz 2708, 2709; 

 Buenos Aires, 7^7^ier 3585; Salinas Bay. Tondftz 2S(i5; San Francisco de Guadalupe, 

 Totiduz 8447; Alajuelila, altitude 1,000 meters. Tonduz 8841; Boruca, Tonduz 4477; 

 Mano de Tigre, altitud(* 500 jneters, Tonduz 4039. 



la, Dicliromena eiliata vahliana C. B. Clarke, in Turban, Sym1>. AntilL 2; JOl. 



1900. ^ 

 Sclioenus ii'mdfoliusW, B. K. Xca . Gen. ifc S]). 1: 228. 1815. 

 Rynchospom raJiUufia (\vi^i'\). FL Ibit. "West Ind. 577. ISfM. 



Stolons long. 



Distribctton: Cuba, Guadalup<\ Costa Rira. 



Costa Rican collection: Xicoya, Tonduz 1:^.913. 



« The specific name arundinaceum as oldest is here a<lopted in accordance with 

 current practice instead of spathaccum used in Mr. Clarke's manuscript. — Eoitoi^ 

 '^Tlie name tenidfolia is older than raA/ta/ut and unoccui)ied. — Editok. 



