Oedeb 155.— CYPERACE.E. 745 



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

 lvs. linear-setaceous, much shorter than the stem; corymb3 small, fasciculate, tho 

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

 ovate, acute, dark brown ; bristles 6, a third longer than tlie roundish-ovoid acheni- 

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



19 R. filifolia Torr. (nee Kunth). Culm filiform, 6 to 12 to 18' high, lvs. fili- 

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

 2 or 3 small fascicles, tho lateral pedunculate ; seioz 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 2\os. \1 

 and 18. 



20 R. Ba.ldwinii Gray. Culms slender, acutely 3-angled, 2 to 3f high; lvs. linear, 

 acute, keeled, 2 ' wide, glaucous, not ciliate, spikes ovate, in a crowded, fasciculate, 

 terminal corymb; sdee 12, upwardly hispidulous, a3 long as tho smooth, roundish- 

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



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

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

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

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

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

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

 and pyncocarpa Gray.) 



22 R. glomerata YahL Culm slender, smooth, leafy, a foot or more high ; lvs. 

 fiat, cariuate, rougl>edged; corymbed fascicles very remote, in pairs, axillary and 

 terminal ; spLkelets lanceolate ; glumes keeled, mucronate, brown ; ach. obovoid 

 or cuneiform, very smooth as long as the tubercle ; setae G, rough, backwards. — 

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



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

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

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

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

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



24 R. fascicularis Xutt. Culm teretish, 1 to 2f high, veiny; lvs. narrowly linear, 

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

 terminal fascicles, and usually several axillary ones; seta? 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. ciliata YahL Plant light glaucous; culm 8' to 2f high, ancipital, striate; 

 lvs. 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 Kutt Culm slender, wiry, teretish, 1 to 2f high; lvs. 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; seta upwardly his- 

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

 large as in R. glomerata. — K. Car. to Fla. Name not very appropriate. 



15. CERATOSCHCTNUS, Nccs. (Gr. Kepag,— arag, a horn, oxoXvog, 



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

 2 — 5-fiowered, one flower $ , the rest $ ; glumes loosely imbricated, 

 somewhat 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. — % Stems leafy. Corymbs 

 •compound. 



1 C. longirostris Torr. Glabrous and glaucous; culm 3 — If higli, triangular; 

 lvs. 12 — 1G' by 4 — 6'', fiat, rough-edged; its. in very large, terminal and axillary 

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

 fascicled in 4s or 5s on the long peduncles ; glumes brown, ovate ; bristles shorter 



