TRIANDRIA.— MONOGYNIA. 43 



HAB. Boggy woods. If.. Involucr. 5-leav.; spike- 

 lets distichous, compressed, yellowish; seed black. 



40. ERIOPHORUM. Cotton-grass. Cyperoideae. 

 * Spike solitary* 



1. E. alpinum: culm triquetrous, somewhat scabrous, 



naked ; leaves very short, subulate, ; spike oblong ; 

 woolly hairs crisped, few. 

 HAB. High mountains and bogs. July. If. Culm 

 8; — 10 in. high, sheathed; glum, oblong-lanc. : hairs 

 white, very long. 



2. E. vaginatum: culm terete below, obtusely triangu- 



lar above, smooth and rigid ; sheaths inflated ; spike 

 oblong-ovate ; glumes scarious ; wool straight, 

 dense. 

 HAB. Sphagnous swamps. July. If. Cespitose, a 

 foot high ; leaves numerous ; glum, livid ; wool 

 white. 



* * Spikes numerous. 



3. E. polystachyon : leaves flat, triquetrous at the ex- 



tremity ; culm nearly terete ; spikes on scabrous 



peduncles, nodding. 

 HAB. Swamps. July. If. Culm 1 — 2ft. high, leafy : 



leav. very long; spik. 9 — 12, subterm. ; wool white 



or reddish. 

 \, E. virginieum: culm nearly terete below, obtusely 



triangular above ; leaves flat, very long ; spike? 



clustered, erect, nearly sessile,; involucrum 2 — 3- 



leaved. 

 HAB. Swamps. July. Culm 2 — 4 ft. high; spik. 



ovate, somewhat umbelled ; wool reddish. 

 /3. gracile: culm very slender ; leaves almost filiform. 

 HAB. Cedar swamps. Aug. 

 '». E. angustifolium : culm somewhat triangular ; leaves 



channelled and triquetrous ; peduncles very smooth. 

 HAB. Wet meadows. If-. A foot or more high , 



leav. very narrow ; spik. 3 — 5 ; wool white. 



41. FUIRENA. Cyperoidece. 



P. squarrosa : spikes clustered, (5 — 6) ovate ; culm 

 smooth ; leaves ciliate ; sheaths hairy ; valves ol 

 ihe corolla cordate-ovate. 



