CYPERACE.E. 427 



between Scifpus and Eaiophorum, but I think it nearest the lat- 

 ter. 



2. T. lineatum Peps. : culm 3-angled, leafy ; panicles terminal and 

 lateral, decompound, at length nodding ; involucre 1 2-leaved ; spikes 

 ovate ; glumes lanceolate, somewhat carinate. Scirpus lineatas Mich. 

 S.. lineatus and pendulus Muhl. 



HAB. Swamps. N. Y. to Geor. Aug. If.. Culm 2-~-3 feet 

 high, very leafy. Flowevs in axillary umbels or panicles, at 

 length nodding. 



7. ERIOPHORUM. Linn. 



Glumes chaffy, imbricated ip all directions. Seed surround- 

 ed by very long dense wool. Triandria. Monogynia. 



* Spike solitary. 



1. E. dlpinum Linn. : culm triquetrous, somewhat scabrous, naked ; 

 leaves very short, subulate ; spike oblong ; woolly hairs crisped, few. 

 E. hudsonianum Mich. Trichophorum alpinum Pursh. Muhl. 



HAB. Mountains. N. S. July. II. Culm 810 inches high ; 

 with 3 4 radical sheaths. Spike .a little compressed, flairs 

 6, white, very long. Cotton Grass. 



2. E. vaginatum Linn. : culm . terete below, obtusely 'triangular 

 above, smooth and ri'gid; sheaths inflated; spike oblong- ovate ; glumes 

 Bcarious ; wool straight, dense. E. cespitosum Pursh. 



HAB. Swamps. Arc. Amer. to Virg. July. If. Culms a foot 

 high, cespitose. Leaves longer than the culm. Spike long. 

 Wool white, twice the length of the glumes. 



'.,-*-' ** Spikes numerous. 



3. E. polystachyon Linn. : leaves flat, triquetrous at the extremity ; 

 culm nearly terete > spikes on scabrous peduncles, nodding. E. tenel- 

 lum Nutt. 



HAB. Swamps. N. S. July. It- Culm 12 feet high, 

 smooth. Spikes on long filiform peduncles. Wool white, or 

 reddish. 



4. E. virginicum Linn. : culm nearly terete below, obtusely triangu- 

 lar above ; leaves flat, very long ; spikes clustered, erect, nearly ses- 

 sile ; involucre 2 3-leaved. 



b. gracile Torr. : culm very slender ; leaves almost filiform. 

 HAB. Swamps. Can. to Geor. Var. b. Cedar swamps. N. J. 



July. 2J.. Culm 24 feet high. Leaves few, linear, lone 1 . 



Wool reddish. 



5. E. angustifolium Roth. : culm somewhat triangular ; leaves chan- 

 nelled and triquetrous ; peduncles very smooth. 



HAB. Swamps. N. S. N. to Arc. Amer.. July. !. Culm a 

 foot high. Leaves very narrow. Spikes on short peduncles. 

 Wool white. 



