OnuER 155.— CYPBRAOE.'E. 745 



Z8 R. graoilSnta Gray. Culms 1 to 2f high, very slender or filiform, smooth ; 

 Im. linear-setaceous, much shorter than the stem ; corymbs small, fasciculate, the 

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

 ovate, acute, dark brown; bristles 6, a third longer than the roundish-ovoid adimi- 

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



19 E. fillfdlia 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 ; setcB G, upwardly scabrous-hispid, 

 as long as the roundish-ovate, lens-shaped, smootli achemvm and the hdspid-scab- 

 rous tubercle.— IS. Car. to Fla. Its hispid tubercles distinguishes it from Nos. 17 

 and IS. 



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

 acute, keeled, 2" wide, glaucous, not oiliate, spilces ovate, in a crowded, fasciculate, 

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

 ovate achenium ; stam. 3. — Pine barrens, Ga. 



21 R. dodecandra 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 longer ; spikes ovate (lance-ovate when young), 

 4" long, light chestnut color, pedicellate, in A to e pedunculate corymbs; set^ 6 to 

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

 much longer ; tubercle broad, depressed. — Bogs, S. Ga., Ma. (E. megalocarpa 

 and pyncocarpa Gray.) 



22 R. glomerata Tahl. Culm slenderj smooth, leafy, a foot or mora high ; Ivs. 

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

 terminal ; spikelets lanceolate ; glumes keeled, muoronate, brown ; ach. obovoid 

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

 In bogs. Can. -to Pla. July, Aug. 



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

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

 and terminal, dense, 5 to 7" diam., the 2 upper often near; spikelets lance-oblong; 

 glumes ovate-oblong, dark brown ; setaa 6, twice longer than the achenium ; ach. 

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



24 R. faaoioularis 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 ; setffi half as long as the 

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

 times copiously terminal, again scattered down the culm. 



25 R. ciliata Tahl. Plant light glaucous; culm 8' to 2f high, ancipital, 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 Pla. 



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

 taceous, shorter, mostly at base ; spikes small (1" long), ovate, in a terminal fasci- 

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

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

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



15. CERATOSCHd^NUS, Nees. (Gr. Kepag, — arag, a horn, axoivog, 

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

 2 — 6-flowered, one flower ^ , the rest $ ; glumes loosely imbricated, 

 somewhat in 2 rows, lower ones empty ; perig. of 6 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, triangular; 

 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, loosdy 

 fascicled in As or 5s on the long pediwruiks ; glumes brown, ovate ; bristles shorter 



