y44 ORDER 155. CYPERACE^E. 



drooping panicles ; seta nearly twice longer than the rugous, oblong, flattish ache- 

 nium and short tubercle. Wet soils, S. Car. to FJa, and La, (Schoenus MX.) 



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

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

 wide; spikes obovate, att pedicellate, 3 to 5-flowered, forming diffuse, compound, 

 axillary and terminal cymous panicles; setae, 6, a little longer than the roundish 

 obovate achenium and very short tubercle. Wet pine barrens, N. Car. to Fla. 

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



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

 smooth, 2 to 3" wide; spaces ovate, large (4 to 5" long), pedicellate 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 achenium ; 

 tubercle flattened, conical, a third as long as the achenium. Wet soils, N. Car. 

 to Fla. 



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

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

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

 pedunculate panicles; glumes fuscous, broad-ovate; setee twice as long as the 

 obovate, flat, rugous achenium 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; Ivs. 

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

 ered corymbs, of which the terminal one is much the longest ; setae scarcely ex- 

 ceeding the roundish, flattened, strongly rugous achenium and tubercle, the latter 

 nearly half as long as the 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, the cauline short; spikes ovate, sessile in fasci- 

 cles forming 3 or 4 few-flowered, subsimple corymbs, borne on exserted peduncles ; 

 setae a little longer than the roundish-ovate, minutely rugous achenium ; tubercle 

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



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

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

 1 to 2" long, loosely fascicled in several approximate, pedunculate corymbs ; setae 

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

 grounds, N. Car. to Fla. 



13 R. punctata Ell. Culm slender, 3-angled, 1 to 2f high; Ivs. lance-linear, 

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

 late corymbs ; setae a little longer than the achenium, which is ovate, 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 16' 

 high ; Ivs. linear-setaceous, channeled ; corymbous fascicles pedunculate, both ter- 

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

 late, acute at each end, with crowded, lanceolate, whitish glumes ; setce 9 or 10, 

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



15 R. Knieskrnii Carey. Culms in tufts, 6 to 16' high, slender; Ivs. mostly 

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

 distant along the whole length of the culm / seta3 6, downwardly hispidulous, as long 

 as the minute, obovate achenium. In bog iron soil, N. J. (Holton), rare. (R. 

 distans? Nutt.) 



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

 setaceous, much shorter than the 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 6, much longer than the oblong, substipitate achenium ; tuber- 

 cle about half the length of the achenium. Swanms, N. Y. (Sartwell), Penn. to 

 Mich. 



17 R. fusca Roem. & 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 seta. Wet places, Mass, to N. J., rare. 



