I i.\i:ki in i. CI n.i: \< i \i "i C0S1 A i;i< \. H". 1 



into 1-eeeded joints. Type far removed from the Eucyperaceae b) its closely jointed 

 culm and n~ hj pogynoiifl l>n-i les. 



Species I . American. 

 1. Dulichium arundinaceum T.. Britton, Bull. Ton*. Hub 21: 29. l v 



Cyperus arundinaceus I.. Sp. PI. 1: M. L753 



Schoenus spathaceus L. sp. PI. ed. ~. 1: 63. L762. 



Oyperu* ferrugineus I.. Sp. PI. ed. 2. 1: 63. 1762, .i- citation. 



Dulichium spathaceum I.. C. Rich, in Pere. Syn. 1: 65. L806. 



Scirpus spathaceus Michx. Fl. 1: 32. 1802 



Stems 40 to 100 cm. long , with 20 to K) nodes; leaves L0 cm. long, 6 mm. wide; pan- 

 icle 10 to 30 cm. long; lower brads leaf-like, distanl from each other by about I to 5 cm. 

 .-pikelets 2 cm. long, 3 nun. in diameter, subterete; hypogynous bristles rather rigid, 

 surpassing the nut. 



Distribution: From Canada ami Oregon to Florida and California, frequent; 

 < !osta Hica. 



< "- 1 \ Ri< w collections: Lomas del Silencio, Diqufs Valley, altitude 600 m< 

 Pittier L203. 



12 DICHROMENA Vahl. 



Glumes very many, closely compacted in many spirals; ■', or more of the lowesl 

 vacant. 1 to '■'> nexl above these bisexual, perfecting nut-: several of tie- uppermost 

 staminate only ami infertile; hypogynous bristles none; stamens •) or 2, anterior; 

 Btyle linear, its 1. ranch.- _'. linear, longer than the undivided part; nut sessile, obovoid 

 or orbicular, compressed, crowned with pyramidal, depressed or conical persistent 

 style-base. — Plants rather slender, the leaves narrow. Stuns naked, monocephalous. 

 Spikelets whitish, capitate. Bracts exceeding the inflorescence, narrow, dilated and 

 whitish at base. 



Species 1:1. peculiar to tropic and Bubtropic America. 



Spikelets white, subspicately capitate 1. I), ciliata. 



Spikelets cinnamon-color, 1 t«> 5, sessile l'. I>. adicans. 



1. Dichromena ciliata Vahl. Enum. 2: 240. L80I 



Dichromena nervosa Vahl, Enum. 2: 241. 1806, in pan. 



Schoenus globosus H. B. K. Nov. Gen. ,v Sp. 1: 229. 1815. 



Dichromena pura Neee, Linnaea 9: 291. I s :! i. 



Rynchospora nervosa Boeckl. Linnaea 37: 529. 1873, the synonym Dichromena />"!- 

 cheUa Kunih excluded. 



Distribution: Central America and tropical South America. 



3ta Rican collections: Hoffmann 608; Turrialba, Tondm 8228; San Jos^, alti- 

 tude L", 100 meters, Pittier 4216, Tondm 132, 1232; Guanacaste, Tondui 2708, 2709 

 Buenos Aires, Pittier 3585; Salinas Bay, Tondui 2865; San Francisco de Guadalupe, 

 Tondm 8447; Alajuelita, altitude 1,000 meters, Tondui 8841; Boruca, Tondm 4477; 

 ManodeTigre, altitude 500 meters, Tondm Hi:'.!'. 

 la. Dichromena ciliata vahliana C. 1'.. Clarke, in Urban, Symb. A in 1 11 2: 101. 



Schoertus tenuifolius II. B. K. \'<>\. Gen. A: Sj,. l: 228. L815. 



Rynchospora vahliana Griseb. Fl. Brit. West End. 577. I v <>! 



Stolons l( mg. 



Distribution: Cuba, Guadalupe, Costa Rica. 



Costa Rican collection: Nicoya, Tondm 13943. 



"The specific name arundinaceum as oldest i- here adopted in accordance with 

 •urrent practice instead oi spathaceum used in Mi - . Clarke's manuscript. -Editor. 

 ''The name tenuifolia is older than vahliana and unoccupied. Editor 



