572 CLX. CYPERACEZ. ERIOPHORUM. 
11. S. BrunNevs. Muhl. . 
S/. obtusely triangular, leafy, 2—3f high; cyme decompound, its principal 
pranches about 5, unequal, with truncate sheaths at base; spikelets clustered in 
heads of 3—6; glumes obtuse, reddish-brown; ach. smooth, yellowish-white, 
shorter than the 4 or 5 tortuous bristles—Much resembles the last species. 
Margins of waters, N. Eng. to Penn, W. to Ohio, rare. 
§ 2. TricopHorum. Bristles 6, much longer than the achenium, tortuous, 
smoothish. Stem leafy. Umbel decompound. 
12. S. EriopHorum. Michx. (Tricophorum cyperinum. Pers.) 
St. obtusely triangular, leafy, 3—5f high; Jws. 2f long, rough-edged; wm- 
bel terminal, decompound, large and loose ; spikes mostly pedicellate ; bristles 6, 
capillary, curled, very conspicuous, being 5 or 6 times as long as the white 
achenium.—A common, stiff, rank meadow sedge, which cattle do not eat, U.S. 
and Can. Spikes numerous, 2—3” long, ovoid, obtuse, in small clusters, in a 
large, showy panicle. Involucre 4-leaved. Aug. ‘ 
13. S. tingAtus. Michx. NS sees Pers.) 
St. triangular, very leafy, 2—3f high; wmbels terminal and axillary, de- 
compound, at length nodding; invol. of 1—2 bracts, longer than the leaves; 
spikes ovoid, pedunculate, solitary; glumes lanceolate, ferruginous ; bristles 6, as 
long as the glumes.—Swamps, in most of the States. Aug. 
8. ERIOPHORUM. 
Gr. ep.ov, wool, ¢epw, to bear; alluding to the copious bristles of the perigynum. 
Glumes imbricated all around into a spike; achenium invested in 
very long, dense, woolly or cottony hairs—Stem generally leafy. 
Spikelets mostly in wmbels, finally clothed with the long, silky havrs. 
* Spikelet solitary. 
1. E. aLPinum. 
St. very slender, acutely 3-angled, naked, somewhat scabrous, 8—16’ high, 
with 3—4 radical sheaths; radical lvs. very short, subulate; spike oblong, ter- 
minal, about 2” in length; hairs 6 to each flower, woolly, white, crisped, 4 times 
as long as the spike.—Bog meadows, often alpine, N. H.! to N. Y. and Penn. Jl. 
2. E. vacinitum. Sheathed Cotton Grass. 
Sts. densely czspitose, obtusely triangular, slender, smooth and rigid, 1— 
2f high; uppermost sheaths inflated; spikelet ovate, oblong, 6—8” long, of a 
blackish color, with scarious glumes; hairs 30—40 to each flower, straight, 
white and glossy, twice as long as the spikelet, conspicuous, as well as in other 
species, even at a distance among the meadow grass.—N. Eng. to Mich., N. 
to Are. Am. June, July. ; 
* * Spikelets numerous. 
3. E. conFERTISsiMuM. Wood. Dense-headed Eriophorum. 
St. strictly erect, firm but slender, 2—3f high; Jvs. narrowly linear, chan- 
neled, rigid, triangular-subulate above, 8—12’ long; sheaths close; invol. 2- 
leaved, one leaf twice, the other 4—5 times longer than the spikelets; spikelets 
5—8, crowded, erect, on very short (2—4”), slightly scabrous peduncles, 20—30- 
flowered ; glwmes obovate, carinate, very obtuse ; ach. compressed, oblanceolate, 
14” long, flat on one side, carinate on the other ; bristles 100—200, white, 4’ long, 
straight and silky—Bogs, Meriden, N. H.! Distinguished for its very large 
and dense heads. ; 
4. E. ponystacHyum. Many-spiked Cotton Grass. 
St. somewhat triangular, smooth, 1—2f high; cauline ws. 2—3, broad- 
linear, flattened below, triquetrous at the end; spikelets about 10, on rough pe- 
duncles which are long and drooping and sometimes branched; sete 30—40 to 
each flower, reddish-white, 6—8” long.—Very conspicuous in meadows and 
Swamps, U.S. and Brit. Am. 
5. E. ancustirouium. Rich. Narrow-leaved Cotton Grass. 
St. slender, leafy, smooth, 10—15’ high; cauline lvs. narrow, 3-cornered, 
with coneave sides, 1—3’ long; invol. of one bract, with a loosely sheathing 
