398 CYPERACE^. 



9. ISOLEPIS. Brmvn.—lsolepis. 

 (From the Greek taog, equal, and >^cTng, a scale.) 



Scales imbricate on all sides. Bristles none. . Style 3-cleft, 

 simple at the base, or with a minute bulb from which it sepa- 

 rates. Achenium triangular, often crowned with the base of 

 the style. 



/. capilluris R. cf« ^S". : culm capillary, angular and sulcata, nearly naked; 

 leaves setaceous, much shorter than the culm ; spikes umbelled, usually 

 4, terminal, on short rays, ovoid-oblong ; scales somewhat 4-rowed, oblong, 

 obtuse. Scirp^is capillar is Linn. . 



Sandy fields. N. Y. and Mass. to Car. W. to Ohio. Aug., Sept. 0. — 



Culms 4 — 8 inches high, densely cespitose. Leaves mostly radical, setaceous. 



Spikes umbelled, somewhat quadrangular. Scales rusty brown with a green 

 keel. Hair-like Isolepis. 



10. TRICHELOSTYLIS. Z,es^i7.— Trichelostylis. 



(From the Greek rpt^^twi/, hairy, and crvXoi, a style; the style being often 

 hairy. Torr. N. Y. Fl.) 



Scales mostly 4 — 8-ranked, keeled. Bristles none. Style 

 3-cleft, more or less bulbous at the base, deciduous below the 

 bulb. Achenium triangular. 



T. mucronulata Torr.: culm compressed, ancipital; involucre 2 — 3- 

 leaved, shorter than the compound spreading umbel ; spikes oblong, acute ; 

 scales about 4-rowed, ovate-lanceolate, mucronate, with the points some- 

 what spreading. Scirpus autumnalis Pursh. S. mucronulatus Mich. 



Low grounds. N. Y. and Mass. to Flor. W. to Miss. July, Aug. %. — 

 Culms 8 — 12 inches high, cespitose, often spreading or decumbent. Leaves \ery 

 acute. Spikes solitary or 2 — 3 at the extremity of the rays. Scales rusty col- 

 ored, keeled. Common Trichelostylis. 



III. FuiRENE^. Spikelets perfect. Scales imbricate on all sides. 

 Achenium with three scales or leaflets often alternating with three bris- 

 tles. Stamens 3. Style 3-cleft . 



11. FUIRENA. Rottb.—Fmrenai. 

 (Named in honor of G. Fuiren ; a Danish botanist.) 



Character same as that above given. 



F. squarrosa Mich. : culm obtusely triangular, sulcate ; leaves ciliate ; 

 sheaths hairy ; spikes 3 — 12, clustered, ovoid ; bristles none ; scales cordate 

 or ovate, unguiculate. jP. squarrosa and Torreyana Beck Bot. \st Ed. 

 P. pumila Spreng. 



Sandy swamps and bogs. N. Y. and Mass. to Geor. and Louis. Aug. % 

 ■ — Culm varying in height from 2 — 18 inches. Leaves smoothish or somewhat 

 hairy. Spikes 4 — 12 inches long, forming an. irregular terminal .umbel. Scales 

 hairy, witn a long slender recurved bristle. Squarrose Fuirena. 



