Hkmicarpha. CLX. CYPERACEiG. 573 



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

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



(). E. ViHGiNicuM. Viriiinii/n Coffmi irrass. 



Sf. nearly round, leafy, smooth, 2 — I^fhigh; /r.s-. flat, few, long, with 

 scabrous margins; inrol. 2 — 4-leav('(l, outer leaves much longer; apikdels in a 

 sort ol umbel, erect, nearly sessile; i^tinncs ovate, brown at the sides; keel 

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

 and Can. 



9. FIMBRISTtLIS. Vahl. 



Lat.Jimbrls, a fringe, stylus, Htyle ; from the ciliate style. 



Glumes imbricated on all sides ; bristles ; style compressed, 

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

 icith the habit of Scirpus. 



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

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



imbel mostly simple, 3 — ^1-rayed, central spikelets sessile; invol. subulate, 

 2-leaved, as long as the umbel ; .'^pikelets ovoid, acute ; glumes ovate, brown ; 

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

 places, Middle, Southern and Western Stales. July. 



2. F. sPADicKA. Vahl. (Scirpus .spad. Liym. S. castaneus. Michx.) 



SI. 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. con.spicuously fimbriate ; ach. whitish. — Marshes, 

 N. J. to La. Aug. 



10. TRICHELOSTlTLIS. Lestiboudois. 



Gr. rpi'^rjXoi, three-fold, oruXoj ; 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 terminal umbels. 



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

 nalis. R. (^ S.) — St. compressed, 2-edged, caespitose, leafy at ba-se, 3 — 10' 



high ; Its. flat, linear, shorter than the stem ; uvibel compound ; invol. 2-leaved ; 

 spikelets 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. CAPiLLARis. Wood. (Scirpus. Linn. Isolepis. R. <^ S.) 



St. cae.spitose, 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. fijiiavs, 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. sauARRosA. Nees. (Isolepis subsquarrosa. SchraJ. Scirpus subsq. 



Mnhl. S. minimus. 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 ; invni. 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. — Sandy banks, N. Eng. ! to Penn. and Ky. 



