396 CYPERACE^E. 



10. S. brunneus Mukl. : culm obtusely triangular, leafy ; cyme decom- 

 pound ; involucre 3 4-leaved ; spikes round-ovoid, clustered in heads of 3 

 to 6 or 8 ; scales ovate, obtuse, slightly mucronate ; style 3-cleft ; acheniuna 

 minute, plano-convex, short-acuminate. 



Swamps and margins of ponds. N. Y. to Car. ; rare. July, Aug. Tj.. Culm 

 2 3 feet high, obtusely triangular below. Leaves broad, as tall as the cyme. 

 Spikes longer than in the preceding. Scales at first yellowish-green, at length 

 reddish-brown. Bristles 4 6, slender, pubescent. Brown Club Rush. 



11. S. Eriophorum Mich. : culm leafy, obtusely triangular above, nearly 

 terete below ; panicle decompound, large, loose, somewhat nodding ; invo- 

 lucre many-leaved, very long ; scales lanceolate ; bristles 6, much exserted, 

 capillary, tortuous. Trichoph&rum Cyperinum Pers. Eriophorum Cyperi- 

 num Linn. 



Wet grounds. Hudson's Bay to Flor. W. to Ohio and Ken. July, Aug. 

 1J-. Culm 2 5 feet high, leafy nearly to the top. Leaves 1 2 feet long, flat 

 above, rough on the margin. Panicle usually very large, the spikes distinct and 

 pedunculate, or in small clusters at the ends of the rays. Scales with the sides 

 brown and the keel green. Bristles at length so much extended as to give the 

 whole panicle a woolly appearance. Brown Wool-grass. 



12. S. lineatus Mich. : culm triangular ; panicles terminal and lateral, 

 at length nodding ; involucre 1 2-leaved ; spikes oblong, pedunculate ; 

 scales ovate, acuminate, somewhat carinate. Trichophorum lineaium Pers. 



Boggy places. N. Y. to Geor. W. to Miss, and Texas. Aug. ^.Culm 

 1 3 feet high, very leafy, distinctly triangular. Leaves rough on the margin. 

 Panicles somewhat umbellate, the terminal one largest, the lateral ones some- 

 times wanting. Scales rusty colored. Bristles crisped, somewhat exserted. A 

 smaller plant than the preceding. Loose-flowered Wool-grass. 



7. ERIOPHORUM. Linn. Cotton- Grass. 



(From the Greek epiov, wool, and ^row, to bear ; the fruit being covered with 

 wool-like hairs.) 



Scales of the spike imbricate on all sides. Achenium densely 

 invested with long soft woolly or cottony hairs. Stamens 3. 

 Style 3-cleft. 



* Spike solitary. 



1. E. alpinum Linn. : culm triangular, somewhat rough, with short sub- 

 ulate leaves- at the base; spike oblong; scales keeled; hairs 6, crisped. 

 E. Hudsonianum Mich. Trichophorum alpinum Pursh. 



Sphagnous swamps, often on mountains. N. H. Ver. Mass, and N. Y. W. 

 to Mich. June. '4- Culm 8 10 inches high, with a few short leaves and 

 sheaths at base. Spike somewhat compressed. Scales yellowish-brown. Hairs 

 white, very long. Alpine Cotton-grass. 



2. E. vaginatum Linn. : cujm terete below, ohtusely triangular above, 

 somewhat rigid ; sheaths inflated ; spike ohlong-ovdid ; scales scarious ; 

 hairs straight, dense. E. ccspitosum Pursh. 



Swamps, especially on mountains. Arct. Amer. to Virg. July. '2J.. Culms 

 about a foot high, cespitose. Leaves longer than the culm , very narrow. Scales 

 dark-colored when in fruit. Hairs very numerous, white, 2 3 times the length 

 of the scale. Hare's-tail Cotton-gra**. 



