Hemicarpha. CLX. CYPERACEiE. 573 



base ; spikekts 2—4, on short peduncles, nodding ; setcs 40—50 to a flower, long, 

 white and cottony. — Swamps, N. States and Brit. Ani, July. 



6. E. ViKGiNicuM. Virginian Cotton grass. 



St. nearly round, leafy, smooth, 2— 3f high ; Ivs. flat, few, long, with 

 scabrous margins ; invol. 3— 4-leaved, outer leaves much longer; spikelets in a 

 sort of umbel, erect, nearly sessile ; glum£S ovate, brown at the sides ; keel 

 green ; hairs 50—60, reddish-white, long and cottony.— Wet grounds, U. S. 

 and Can. 



9. FlMBRISTl?'LIS. Vahl. 

 L^t. fimbris, a fringe, stylus, style ; from the ciliat« style. 



Glumes imbricated on all sides ; bristles ; style compressed, 

 2-cleft, bulbous at base, deciduous, often ciliate on the margin. — % 

 with the habit of Scirpus. 



1. F. Baldwiniana. Torr. (Scirpus Baldwinianus. Schult. S. ferrugin- 

 eus. Darl.)—St. 2 — 12' high, compressed, deeply striate, leafy at base; 



umbel mostly simple, 3— 4-rayed, central spikelets sessile; invol. subulate, 

 2-leaved, as long as the umbel ; spikelets ovoid, acute ; glumes ovate, brown ; 

 sty. bifid, ciliate; ach. white, longitudinally furrowed. — Swamps and damp 

 places, Middle, Southern and Western States. July. 



2. F. SPADICEA. Vahl. (Scirpus spad. Linn. S. castaneus. Michx.) 



St. 1— 2f high, hard and rigid, compressed, nearly naked; Ivs. 5 — 6' 

 high, filiform, channeled inside, semi-terete outside, lower ones rust-colored ; 

 umbel of few rays, rather exceeding the 2 — 3 subulate, involucre leaves; spikes 

 ovate-oblong, 3 — 6" long ; glumes broad-ovate, mucronate, finally of a dark, 

 shining, chestnut brown ; sty. conspicuously fimbriate ; ach. whitish. — Marshes, 

 N. J. to La. Aug. 



10. TRICHELOSTl^LIS. Lestiboudois. 

 Gr. TpL^Ti\oi, three-fold, oruXos ; from the character. 



Glumes in 4 — 8 ranks, carinate ; bristles ; style 3-cleft, decidu- 

 ous below the bulb at the base ; achenium triangular. — % Stems leafy 

 at the base. Spikes usual ly in terminal umbels. 



1. T. MucRONLLATus. Torr. (Scirpusmuc.il/tc/ia;. Fimbristylis autum- 

 nalis. R. tf* S.) — St. compressed, 2-edged, cajspitose, leafy at base, 3 — 10' 



high; Ivs. flat, linear, shorter than the stem; umbel compound; invol. 2-leaved; 

 spikekts lanceolate, acute, somewhat 4-sided, 2 — 3 together; glumes brown, 

 mucronate ; ach. white.— Wet places, along rivers, &c., N. Eng. ! to Ga., W. 

 to Mo. July. 



2. T. CAPii.i.ARis. Wood. (Scirpus. Linn. Isolepis. R. df* S.) 



St. cccspitose, nearly naked, 3-angled, capillary, 4 — 8' high; Ivs. subradi- 

 cal, setaceous, shorter than the stem ]'spiktlcts ovoid, 2 — i, pedunculate, inner 

 one sessile; glum£s oblong, Jerruginous, margin pubescent; ach. white.— In 

 sandy fields, Mass. to Car., W. to Ky. and Ohio. Aug. 



11. HEMICARPHA. Nees. 



(Ir. fijiiavi, half, Kap<l>a, straw or chaff? 



Glumes Imbricated all around ; bristles ; stam. 1 ; style 2-cleft, 

 not bulbous at base, deciduous ; achenium compressed, oblong, sub- 

 terete. — % Spikes glomerate. 



H. .sQiAHitosA. Nees. (Isolepis sub.squarrosa. Schrad. Scirpus subsq. 



Muhl. S. minimus. Ph.) — ScajK setaceous, compres.scd, sulcatc, recurv- 

 ed, ^—3' high; Ivs. setaceous, .shorter than the scape; .spikes 2 — 3, terminal 

 (apparently lateral), subsessile, ovoid, nearly 2" long ; invol. of 2 bracts, one 

 appearing like a rontimiation of the scape, thrice longer than the other; glu7nc.<i 

 00, with a short, recurved or scjuarrose point, finally brown; orh. minute, of a 

 dull, brownish-white. — Sandy banks, N. Eng. I to Penn. and Ky. 



