576 CYPERACE.E. 



Sect. 5. Dichromena, V. — No bristles below the Jtoicer. Style 2-fid. 

 * Spikelets fascicled, or corymbose ; glumes convex, rarely keeled. 



79. R. spermodon, Gr. Stem slender, filiform ; leaves setaceous ; spikelets pale, or 

 pale-brown, lanceolate-acuminate, in terminal and axillary fascicles, exceeded by the sup- 

 porting leaf ; lower glumes elliptical, awned-mucronate, superior lanceolate; achenium 

 greenish-brown, roundish, transversely wrinkled-undulate, %-dentate-emarginate, much 

 longer and broader than the short, compressed-conical, blunt, blackish beak. — Rottb. 

 Bescr. I. 21./. 2; Mart. Fl. Bras. 3. t. 8./. 1.— Schcenus setaceus, Rottb. (Spermodon, 

 P. B., Dichromeua, Kth) — Root fibrous, at length stoloniferous ; stems 6"-12" high; 

 spikelets 2"'-3'" long, geminately clustered, or single, often few in the shortly peduncled 

 fascicle. — Hab. Jamaica, Wullschl., in dry pastures: [Guiana!, Brazil]. 



80. R. filiformis, V. {sec. Kth.). Stem slender, rigid, filiform ; leaves setaceous ; spike- 

 lets brown, or pale-brown, lanceolate-linear, acuminate, in simple, terminal, and a few axil- 

 lary corymbs ; lower glumes elliptical-oblong, awned-mucrenate, superior lanceolate-linear; 

 achenium brown, roundish, slightly scabrous-dotted, truncate, obsoletely 2-dentate, supported 

 by a cuneate disk, much longer and broader than the short, compressed-conical, 6lw»i> 

 blackish beak.— Dichromena, Kth. Spermodon, Ns. I— 8"-15" high; spikelets 5"'-6 

 long. — Hab. Trinidad !, Lockh., in sandy savannahs ; [Brazil !]. 



81. R. cubensis, Gr. Stem filiform, flaccid; leaves setaceous, channelled ; spikelets 

 pain, or pale-brown, lanceolate-acuminate, in simple, terminal, and a few axillary corymbs; 

 lower glumes ovate, superior lanceolate ; achenium roundish, obsoletely wrinkled trans- 

 versely, supported by a minute disk, much longer than and as broad at the summit as the 

 short beak ; beak greenish, compressed-conical, bluntish, emarginate at the base, shortly 

 decurrent. — Dichromena, Pcepp. .• but the achenium is pale in our form. — Nearly allied to 

 (and perhaps a form of) Holoschwnus capillaris, Ns. \ t {Dichromena, Kth.), in which the 

 achenium is deeply wrinkled transversely, l'-lj' high; spikelets 2'" long. — Hab. Domi- 

 nica !, Imr. ; [Cuba I, Lind. 2069]. 



82. R. micrantha, V., Prl. Annual; stem flaccid, filiform; leaves linear, flat; 

 spikelets pale, or pale-brown, ovate-roundish, in terminal and a few axillary, divaricate 

 corymbs: pedicels filiform ; glumes few, ovate-lanceolate, bluntish; achenium pale, or 

 brown, roundish, transversely wrinkled, margined, thrice as long and broader than the 

 short beak : beak greenish, compressed-conical, pointed, shortly decurrent. — Dichromena, 

 Kth. R. sparsa, Sieb. Mart. 259 ! (Haloschcenus, Ns. /).— 4"-8"(-12") high ; leaves 1 

 broad; spikelets scarcely l' 1 ' diam. — Hab. Jamaica!, Pd., along ditches; Antigua!, Wullschl., 

 Dominica !, Imr., S. Vincent !, Guild. ; [Portorico ! and Mexico to Venezuela ! and Guiana]. 



83. R. hirsuta, V. Pilose; stem slender, filiform; leaves narrowly linear, flatfish, 

 or convolute ; spikelets rusty-brown, ovate-lanceolate, several-flowered, clustered in ter- 

 minal, and a few axillary, spreading corymbs ; glumes ovate, or ovate-oblong, pointed ; 

 achenium pale, subglobose, densely reticulated-scrobiculate, broader than the short beak : 

 beak brownish, compressed-conical, pointed, truncate at the not decurrent base. — Dichro- 

 mena, Kth.— 6"-10" high ; leaves V" broad ; corymbs 1" diam. ; spikelets U'"-2'" long. 

 — Hab. Trinidad!, Cr., in savannahs. 



** Spikelets in a terminal, exinvolucrate cluster ; glumes keeled. 



84. R. pusilla, Gr. Low, crespitose ; leaves incurved, flattish, or convolute, cihate, 

 about as long as the filiform stem ; cluster terminal, of a few, white, alternating, oblong- 

 lauceolate spikelets : lateral ones as long as their bract ; glumes ovate-lanceolate ; achenium 

 roundish, slightly wrinkled transversely, obtusely margined : beak brown, short, depressed- 

 conical, bluntish, truncate at the base and as broad as the summit of the achenium. — Sw. 

 Ic. Iud. Occ. t. 6. — Schnenus, Sw. : style wrongly described by Swartz as being 3-fid. 

 Dichromena, Kth. — 1"-3" high j spikelets approximate, 1'" long ; achenium yellow, or 

 black. — Hab. Jamaica !, Wils., JH'A'ab, Wullschl., on wooded, rocky hills ; [Cuba !, 

 Guadeloupe !]. 



*** Spikelets in a terminal head, included within the often coloured base of 

 the long involucre ; glumes keeled. 



85. R. stellata, Gr. Wholly glabrous; rhizoma creeping; stem angular; cluster 



