CYPERACE.E. 397 



:.- ** Spikes numerous. 



3. E. polystachyum Linn. : culm nearly terete ; leaves flat, triangular at 

 the extremity; involucre about 2-leaved; spikes on scabrous peduncles, 

 nodding; scales ovate, acute. E. polystachium 0. Mich. E. vulgare. 

 Pars. 



Bogs and marshes. Can. to Geor. W. to the Rocky Mountains. June. ty. 

 Culm 1 2 feet high, smooth. Spikes 4 12, on long filiform peduncles. 

 Scales green, at length brown. Hairs very numerous, long, white with a red- 

 dish tinge. Broad-leaved Cotton-grass. 



4. E. Virginicum Linn. : culm nearly terete below, obtusely triangular 

 above; leaves flat, very long; involucre 2 3-leaved; spikes clustered, 

 erect, nearly sessile. 



Swamps and wet meadows. Hudson's Bay to Flor. W. to Miss. July, 

 Aug. 1J-. Culm 24 feet high, leafy. Peduncles somewhat umbellate. Scales 

 with pale sides and a green keel. Hairs very numerous, tawny. 



Rusty Cotton-grasg. 



5. E. angustifolium Roth. : culm somewhat triangular, roughish above ; 

 leaves triangular, channelled ; involucre mostly 1-leaved; peduncles smooth, 

 nodding ; scales broad-ovate, obtuse. E. tenettum Nutt. 



Wet meadows. Arct. Amer. to Del. June. %.. Culm 1218 inches high, 

 leafy. Spikes 4 10, ovoid ; 1 or 2 nearly sessile, the others on peduncles. Hairs 

 very numerous, long, white and cottony. Narrow-leaved Cotton-grass. 



8. FIMBRISTYLIS. Vahl. Fimbristylis. 

 (From the Latin fimbria, a. fringe, and stylus, a style.) 

 Scales imbricate on all sides. Bristles none. Style com- 

 pressed, 2-cleft, more or less bulbous at the base, wholly de- 

 ciduous, mostly ciliate on the margin. 



1. F. spadicea Vahl: culm compressed, nearly naked; leaves semi- 

 terete, filiform, channelled ; involucre rigid, 2-leaved ; umbel of few rays, 

 simple or compound ; spikes ovoid-oblong ; scales rigid, broad-ovate, ob- 

 tuse. Scirpus spadiceus Linn. 



Salt marshes. N. Y. to Flor. W. to Texas. Aug., Sept. 1\..Culm 12 

 feet high, compressed above, rigid, smooth. Leaves nearly radical, rough on 

 the margin. Scales chestnut colored when old. Tall brown Fimbristylis. 



2. F. Baldwiniana Torr. : culm somewhat compressed, deeply striate, 

 leafy at base ; leaves narrow-linear, striate, serrulate ; involucre subulate ; 

 umbel subcompound; spikes ovoid-lanceolate, acute; scales smoothish, 

 ovate, mucronate. Scirpus Baldwinianus Schultes. 



Moist places. Penn. to the Gulf of Mexico. W. to Miss. July. QJ.?- Culm 

 4 12 inches high. Leaves about as long as the culm. Umbel small, some of 

 the rays divided. Scales with the keel greenish and the sides chestnut brown. 



Baldwin's Fimbristylis. 



3. F. cylindrica Vahl : involucre about 1-leaved, rigid, as long as the 

 simple umbel ; spikes cylindric, very obtuse. 



Quaker's Bridge, N. J. Schweinitz. 1L An obscure species. 



Cylindrical Fimbnstyli*. 



