744 ORDER 155. CYPERACE^E. 



drooping panicles ; sefcs nearly twice longer than tho rugous, oblong, flattlsli ache- 

 nium and short tubercle. "Wet soils, S. Car. to Fla, 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, all pedicellate, 3 to 6-flowered, forming diffuse^ compound, 

 'axillary and terminal cymous panicks; 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.) 



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

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

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

 the outer broad ; setae 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 ; setse twice as long as the 

 obovate, flat, Yugous 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; setse scarcely ex- 

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

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



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

 glabrous, serrulate on the margins, the cauline short; spikes ovate, sessile infasci- 

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

 setse a little longer than tho roundish-ovate, minutely rugous achenium ; tubercle 

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



12 R. microcdrpa 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 tho 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; seta? 11 little longer than the achenium, which is ovate, com} 



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



14 R. alba Yahl, Culm triangular above, very slender, leafy, smooth, 10 1(5' 

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

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

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

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



15 R. Knieskernii 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 ,' setae 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 G to 12' high, filiform, glabrous, triangular; Ivs. 

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

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

 ious edges ; bristles G, much longer than the oblong, substipitate achenium ; tuber- 

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

 Mich. 



17 R. fusca Roem. & Schult. Culm 3-angled, about 2f high; Ivs. setaceous-car in- 

 ale ; 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. 



