ilEMiCAnPHA. CLX. CYPERACEJE. 573 



'base . spikelcts 2 — 4, on short peduncles, nodding ; seta: 40 — 50 to a flower, long, 

 white and cottony. — S-vvamps, N. States and Brit. Am. July. 



6. E. ViRGi?.iicuM. Virginiain Cotton grass. 



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

 scabrous margins; invol. 2— 4-leaved, outer leaves much longer; spikelets 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. FIMBRISTt"LIS. Vahl. 



'LaX.Jimbris, a friiife'e, 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. Sckult. S. ferrugin- 

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



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

 ■2-Ieaved, as long as the umbel; spikelets ovoid, acute; glnjKcs ovate, brown; 

 sMj. bifid, ciliate; ach. white, longitudinally furrowed. — Swamps a«d damp 

 places, Middle, Southern and Western States. July. 



2. F. sPADicEA. Vahl. (Scirpus spad. Lin7i. S. -castaneus. Michx.) 



S'. 1 — 2f high, hard and rigid, compressed, nearly naked ; Its. 5 — ^6' 

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

 umi/cl of few rays, rather exceeding the 2 — 3 subulate, involucre leaves; spikes 

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

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

 JN. J. to La. Aug. 



10. TRICHELOST YLIS. Lestiboudois. 



Gr. Tpix^iXoi, three-fold, oruXoj ; from the cliaraeter. 



Glurnes 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 i?i terminal umbels. 



1. T. MUCRONULATUs. Torr. (Scirptis muc. Michx. Fimbristylis autum 

 nalis. R. tf- S.) — St. compressed, 2-edged, csRspitose, leafy at base, 3 — lO' 



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

 spike'cts lanceolate, acute, somewhat 4-sided, 2—3 together; glumes brown, 

 mucronate; ach. v.'hite.— Wet places, along rivers, <&c., IN. Eng. ! to Ga., W 

 to Mo. July. 



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



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

 cal, setaceous, shorter than the stem ; spikelcts ovoid, 2—4, pedunculate, innej 

 one sessile; glum-es oblong, ferruginous, margin pubescent; acL white. — Ir 

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



11. HEMICARPHA. Nees. 



Gr. }]jn<jvi, half, Kap^a, straw or chaffi 



Glumes imbricated all around ; bristles ; stam. I ; style 2-cleft, 

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

 terete. — % Spikes ghmerate. 



H. sQUARRosA. Nees. (Isolepis subsquarrosa. Schrad. Scirpus subsq. 



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

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

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

 app-aringlike a continuation of the scape, thrice longer than the other; glumes 

 00, vith a short, recurved or squarrose point, finally brown; acA. minute, of a 

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



