Ordeb 155.— CTPERAQE^. 746 



18 R. gracil€nta Gray. Culms 1 tij.2f high, very slender or filiform, Bmooth; 

 Ivs. liTiear-setaceaus, much shorter thi^^ the stem; corymbs small, fesoioalate, the 

 lateral on slender peduncles exserted from the sheaths; spikes ovoid; glumes 

 ovate, acute, dark brown ; brisUes 6, a third longer than the romuUsh-ovoJd acheni- 

 rnn; tubercle flat, subulate, as long as the achenium. — Dry grounds, N. Y. to Fla. 



19 R. filifdlia Torr. (neo Kunth). Culm filiform, 6 to 12 to 18' high, Ivs. fili- 

 form, or almost capillary, many, much shorter ; spikes very small (1" long), in 

 2 or 3 small fascicles, the lateral pedunculate ; setce G, upwardly scabrous-hispid, 

 as long as the roundish-ovate, lens-shaped, smooth achenium and the hispid-scab- 

 rous tubercle. — N. Car. to Fla. Its hispid tubercles distinguishes it from Nos. 11 

 and 18. • 



20 R. Baldwfnii Gray. Culms slender, acutely 3-angled, 2 to 3f high ; Ivs. linear, 

 acute, keeled, 2" wide, glaucous, not ciliate, spikes ovate, in a crowded, fasciculaie, 

 terminal corymb; setce 12, upwardly hispidulous, as long as the smooth, roundish- 

 ovate achenium ; stam. 3. — Pine barrens, 6a. 



21 R. dodecdndra Baldw. Culm rigid, 3-angled, 1 to 3f high ; Ivs. rigid, cori- 

 aceous, keeled, rough-edged, broadly linear (2 to 4," wide), all nearly equaling the 

 culm at first, at length the culm louger; spikes ovate (lance-ovate when young), 

 4" long, light chestnut color, pedicellate, in 4 to 6 pedunculate corymbs ; setse 6 to 

 12, as long as the large (1 J" diam.), roundish, smooth achenium ; stam. 10 to 12, 

 much longer; tubercle broad, depressed. — Bogs, S. Ga., Fla. (R. megalocarpa 

 and pyncocarpa Gray.) 



22 R. glomer^ta Tahl. Culm slender, smooth, leafy, a footer mor# high ; Ivs. 

 flat, carinate, rough-edged ; corymbed fascicles very remote, in pairs, axillary and 

 terminal ; spikelets lanceolate ; glumes keeled, mucronate, brown ; aoh. obovoid 

 or cuneiform, very smooth as long as the tubercle ; set^ 6, rough, backwards.^ 

 In bogs, Can. to Fla. July, Aug. 



23 R. cephaldntha Gray. St. 2— 3f high, triangular, stout ; Ivs. linear, very 

 narrow, the lower and radical nearly as long as the stem ; hds. roundish, axillary 

 and terminal, dense, 5 to 1" diam., the 2 upper often near; spikelets lance-oblong; 

 glumes ovate-oblong, dark brown ; setap 6, twice longer than the achenium ; aoh. 

 roundish-ovoid, a little compressed, very obtuse. — N. J. pine barrens. 



24 R. fasciculdris Nutt. Culm teretish, 1 to 2f high, veiny ; Ivs. narrowly linear, 

 much shorter; spikes small (IJ" long), fuscous brown, densely fascicled, in several 

 terminal fascicles, and usually several axillary ones ; setEB half as long as the 

 roundish-obovate achenium. — S. Car. to Fla. Inflorescence quite variable, some- 

 times copiously terminal, again scattered down the culm. 



25 R. ciliEita Vahl. Plant light glaucous; culm 8' to 2f high, anoipital, striate; 

 Ivs. lance-linear, short, obtusish ; spikes elliptical, chestnut-colored, all collected 

 into a dense terminal fascicle with several short bracts ; setae very short, at the 

 base of the roundish, lenticular achenium. — N. Car. to Fla. 



26 R. distans Nutt. Culm slender, wiry, teretish, 1 to 2f high; Ivs. linear se- 

 taceous, shorter, mostly at base; spikes small (l"long), ovate, in a terminal fasci- 

 cle, usually with 1 or 2 lateral, somewhat distinct fascicles ; setse upwardly his- 

 pidulous, about as long as the broad, ovate, smooth achenium which is not half as 

 large as in E. glomerata. — ^N. Car. to Fla. Name not very appropriate. 



15. CERATOSCHCE^HUS, Nees. (Gr. Kepag, — arag, a horn, axolvog, 

 rush ; alluding to the long, persistent style of the achenium.) Spikelets 

 2 — S-flowered, one flower ^ , the rest $ ; glumes loosely imbricated, 

 soniewhat in 2 rows, lower ones empty ; perig. of 5 or 6 rigid, hispid 

 or scabrous bristles ; stam. 3 ; style simple, very long, persistent and 

 crowning the smooth, compressed achenium. — 2f Stems leafy. Corymbs 

 compound. 



1 C. longirostris Torr. Glabrous and glaucous; culm 3 — 4f high, triangiilar; 

 Ivs. 12 — 16' by 4 — 6'', flat, rough-edged; fls. in very large, terminal and axillary 

 corymbs, terminal one the largest ; spikes lanceolate, acuminate, 8" long, loosely 

 fascicled in is or 6s on the long peduncles ; glumes brown, ovate ; bristles shorter 



