Hemicarpha. CLX. CYPERACEtE. 573 



base ; spikelets 2 — 4, on short peduncles, nodding ; set(E 40—50 to a flower, long-, 

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



6. E. ViRGiNicuM. Virginian Cotton grass. 



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

 scabrous margins ; i7ivot. 2 — 4-leaved, outer leaves much longer ; spikeiets in a 

 sort of umbel, erect, nearly sessile ; glumes ovate, brown at the sides ; keel 

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

 and Can. 



9. FlMBRISTtLIS. Vahl. 



hat. Jlmbris, a fringe, stylus, style ; from the ciliate 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. TRICHELOST"?LIS. Le.stiboudois. 



Gr. Tpiyn^oi, threefold, oriiXos; 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 usually in termirial umbels. 



1. T. MUCRONULATUs. Torr. (Scirpus muc. Michx. Fimbristylis autum- 

 nalis. E. <f- S.)—St. compressed, 2-edged, cffispitose, leafy at base, 3—10' 



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

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

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

 to Mo. July. 



2. T. CAPiLLARis. Wood. (Scirpus. Linn. Isolepis. R. tf- S.) 



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

 cal, setaceous, shorter than the stem ; spikelets ovoid, 2—4, pedunculate, inner 

 one sessile ; glumes oblong, ferruginous, margin pubescent ; ach. white.— In 

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



11. HEMICARPHA. Nees. 



Gr. ijixtavg, half, Kap<pa, 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. sau.^RRosA. Nees. (Isolepis subsquarrosa. Sckrad. Scirpus subsq. 



Muhl. S. niinimus. Ph.)— Scape setaceous, compressed, sulcate, recurv- 

 ed, 2—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 continuation of the scape, thrice longer than the other; glumes 

 00 with a short, recurved or squarrose point, finally brown ; ach. minute, of a 

 dull, brownish-white.— Sandv banks, N. Eng. ! to Penn. and Ky. 



