ORDER 155. CYPERACE^E. 743 



2 D. latifolia Baldw. Culm tereteish, stout, 9' to 2f high ; Ivs. broadly linear, 

 very long, overtopping tlie culm ; invol. 8 to 10-leaved, whitish, becoming dull red 

 at the base; ach. roundish in outline (except the tubercle), roughened, dull, the 

 tubercle broad, conical at top, base 2-horned, decurrent on the edges of the ach. 

 with, its horns. Ponds in pine barrens, N. Car. to Fla. 



14. RHYNCHOS'PORA, Valil. (Gr. /&vv#o?, a beak, onopd, seed; 

 from the character.) Flowers g or <3 ? , few in each spikelet; 

 glumes loosely imbricated, tlw lowest small and empty ; perigynium of 

 6 to 12 bristles; stamens 3 to 12 ; style bifid; ac'henium lens-shaped 

 or subglobous, crowned with a tubercle, the distinct, bulbous base of 

 the style. It St. leafy, 3-sided. Inflor. terminal and axillary. Setae 

 hispid (under a strong magnifier). 



Seta} .densely pi unions. Acheninm subglobous-ovoid (terete) Nos. 1,2 



Seta? miked, -denticulate or hispid. Achenium more or less flattened. (*) 



* Achenium transversely rugous. Setaa upwardly bearded, (a) 



a Setse shorter than the acheaium Nos. 3 5 



a Setae equaling or exceeding the ochenium. (b) 



b Spikes in drooping panicles. Achenium oblong No. 6 



b Spikes itt erect w spreading panicles. Achenium roundish Nos. 7 9 



b Spikes corymbous or fasciculate. Achenium orbicular Nos. 10, 11 



Achenium oval Nos. 12, 13 



* Achcnium smooth and even, (c) 



C Culm and leaves very slender, filiform or setaceous, (d) 



d Seta; 6 to 1U, retrorsely hispid (under a strong magnifier) NOR. 14 18 



d Setae 6, upwardly hispid Nos. 1719 



C Culm wiry, firm. Leaves linear, (e) 



6 Stamens 3 or 12. Seta; 10 or 12 Nos. 20, 21 



e Staimns 3. Sette 6, retrorsely hispid, longer than the ach... Nos. 22, 23 



upwardly hispid, shorter than the ach.. Nos. 24, 25 



long as the achenium No. 26 



1 R. plumosa Ell. Culm rigid, wiry, B' to 2f high ; Ivs. rigid, involute, seta- 

 ceous above, half as long as the culm ; spikes lance-ovate, chestnut red, in a ter- 

 minal fascicle, rarely a smaller axillary fascicle below on an exserted peduncle; 

 glumes broad-ovate, acute ; bristle (setae) G, densely plumous, as long as the globu- 

 lar-ovoid, rugous achenium ; tubercle short. Dry pine barrens, N. Car. to Fla. 



/?. SEMIPLUMOSA. Setae feathery half way up, naked and denticulate above, 

 Near N. Orleans (Ingalls. R. semiplumosa Gray., Monog., Rhyn., p. 213). 



2 R. oligaiitha Gray. Culm filiform, 8 to 12' high, with one or two filiform- 

 setaceous Ivs. about the same height ; spikes 2 to 6, pedicellate, rarely solitary, 

 lance-ovate, fuscous-red, lateral near jthe summit of the culm ; glumes ovate, mu- 

 cnonate; setae 6, as long as the ach. and short tubercle, plumous below, hispid 

 above. N. Gar. to Fla., in sandy bogs. 



3 R. cymosa Nutt Calm, I to 2f high, triangular, angles acute; radical Ivs. linear, 

 shorter than the stem, cauline rising above the stem ; corymbs 3 to 4, the terminal 

 largest ; spikelets ovoid, in close fascicles of about 5 ; glumes broad-ovate, dark 

 brown ; bristles 6, as long as the broad ovate, transversely ruguous acheuium ; 

 tubercle depressed, much shorter than the achenium. N". J. to La. Jl., Aug. 



4 R. Torreyana Gray. Culm 2f high, ieretish, slender, csespitous, striate ; Ivs. 

 setaceous, the radical G to 10" long, cauline much shorter; corymbs few-flowered, 

 the lateral, if any, on capillary peduncles ; spikes ovoid, pedicellate or sessile ; 

 glumes ovate, mucronate, brown ; bristles 6, scarcely half as long as the oblong- 

 obovate achenium ; tubercle ehort, nearly as broad at base as the achenium. -N. 

 J. Jl, Aug. (Holton.) 



5 R. rariflora E1L Culms tufted, C to 16' high, filiform, with much shorter, seta- 

 ceous leaves ; spikes lanceolate, fuscous, near 2" long, pedicellate, few in 2 or 3 

 loose, simple, corymbous panicles terminal and lateral ; bracts capillary ; glumes 

 ovate, acute ; setse about 6, nearly as long as the strongly rugous, roundish obo- 

 vate achenium ; tubercle very short. S. Car. to Fla. and La., in bogs. Has the 

 aspect of a Trichelostylis. 



6 R. inexpansa VahL Culm slender, teretish, rather rigid, 1 8' to 3f high ; Ivs. 

 narrowly linear, fiat, smooth, half as long as the culm; spikes lanceolate, fusoous, 

 about 3" long, 3 to 5-flowered, forming several axillary and terminal, rather long, 



