744 Order 155.— CYPERACEjE. 



drooping panicles ; sete nearly twice longer than tho rugous, oblong, flattish aehe- 

 nium and short tubercle. — Wet soils, S. Cur. to Fla. and La. (Schcetms Mx.) 



7 R. miliacea Gray. Culm slender, triangular, very leafy below, 2f high, fistu- 

 lous; lus. rather rigid, flat, lance-linear, smooth, glaucous, 6 to 8' long, 3 to 4 ' 

 wide; spikes obovate, all pedicellate, 3 to 5-ilowered, forming diffuse, compouud, 

 axillary and terminal cymous panicles; seta; G, a little longer than tho roundish 

 obovato aehenium and very short tubercle. — Wet pino barrens, N. Car. to Fla. 

 and La. (R. sparsa Vahl. Schcenus Lam.) 



8 R. caduca Ell. Culm acutely triangular, 1 to 3f high; Ivs. broadly linear, 

 smooth, 2 to 3" wide; spikes ovate, large (4 to 5" long), pedicellato or sessile, in. 

 several rather close, erect, axillary and terminal panicles; glumes caducous, ovate, 

 the outer broad ; setce twice longer than the orbicular-ovate, rugous aehenium ; 

 tubercle flattened, conical, a third as long a3 tho aehenium. — Wet soils, N. Car. 

 to Fla. 



9 R. schesnoides. Culm triangular, 2 to 3f high, leafy at base; Ivs. linear, 2' 

 wide, glabrous, not half the length of tli3 cuirn; spikes very numerous, lance-ovate, 

 small (2 ' Img), sessile or nearly so, clustered, forming several axillary and terminal, 

 pedunculate panicles; glumes fuseous, broad-ovate; setce twice as long as tho- 

 obovate, flat, rugous aehenium and small tubercle. Bogs, Ga., Fla. to La. (Scir- 

 pus, Ell.) 



10 R. patula Gray. Culm 3-angled, thick and stout at the base, 2f high ; lvs. 

 linear, short; spikes ovate, small (2" long), forming several spreading, loose-flow- 

 ered corymbs, of which the terminal one is much tho longest; seta? scarcely ex- 

 ceeding the roundish, flattened, strongly rugous aehenium and tubercle, tho latter 

 nearly half as long as tho former. — Ga. and Fla., rare. 



11 R. Elliottii Gray. Culm 3-angled, slender, 1 to 2f high ; Ivs. linear, flat, 

 glabrous, serrulate on the margins, tho cauline short ; spikes ovate, sessile in fasci- 

 cles forming 3 or A few-flowered, subsimple corymbs, borne on exserted peduncles; 

 seta? a little longer than tho roundish-ovate, minutely rugous aclienium ; tubercle 

 very short, flattened, conic. — Wet soils, Ga. and Fla. Jn. — Sept. 



12 R. microcarpa Baldw. Culm slender, teretish, tufted, nearly naked; lvs. 

 narrowly linear, setaceous at end, mostly radical ; spikes turgid-ovate, dark brown, 

 1 to 2'' long, loosely fascicled in soveral approximate, pedunculato corymbs ; setaj 

 very fragile, scarcely equaling the minute, ovate, flat, rugous aehenium. — Wet 

 grounds, N. Car. to Fla. 



13 R. punctata Ell. Culm slender, 3-anglcd, 1 to 2f high; lvs. lance-lincar, 

 acute, rough-edged ; spikes ovate, chestnut brown, fascicled, in several peduncu- 

 late corymbs; setse a little longer than the aehenium, which is ovale, compressed, 

 and rugous-netted, with impressed dots in the furrows. — Marshes, Ga. and Fla. 



14 R. alba Vahl. Culm triangular above, very slender, leafy, smooth, 10 — 1G' 

 high ; lvs. linear-setaceous, channeled ; corymbous fascicles pedunculato, both ter- 

 minal and from the axils of tho sheaths, with setaceous bracts; spikelcts lanceo- 

 late, acute at each end, with crowded, lanceolate, whitish flumes; scte 9 Or 10, 

 as long as tho ach. and tubercle. — In wet, shady grounds ; common. July — Sept. 



15 R. Knieskernii Carey. Culms in tufts, C to 1G' high, slender; lvs. mostly 

 cauline, setaceous, linear, shorter; spikes small (1" long) in 4 or 5 dense fascicles, 

 distant along the whole length of the culm; seta? G, downwardly hispidulous, as long 

 as the minute, obovato aehenium. — In bog iron soil, N. J. (Ilolton), rare. (R. 

 distans? Nutt.) 



16 R. capillacea Torr. Culm 6 to 12' high, filiform, glabrous, triangular; lvc. 

 setaceous, much shorter than tho stem ; spikes 1 to 3 to 6 (mostly in 1 terminal 

 fascicle), oblong, each with a setaceous bract; glumes chestnut-colored, with scar- 

 ious edges; bristles G, much longer than tho oblong, substipitato aehenium ; tuber^ 

 cle about half the length of tho aehenium. — Swamps, N. Y. (Sartwell), Penn. to 

 Mich. 



17 R. fiisca Room. & Schult. Culm 3-angled, about 2 f high; Ivs.setaceous-carin- 

 ate ; smooth ; fascicles alternate, pedunculate ; bracts setaceous, longer than the 

 ovoid spikes ; glumes brown, ovate ; ach. obovate, its pointed tubercle as long, both 

 equaling the hispid seke. — Wet places, Mass. to N. J., rare. 



