ORDER 155. CYPERACE^E. 743 



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

 very long, overtopping the 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, Vahl. (Gr. fwvxpc, a beak, onopd, seed; 

 from the character.) Flowers $ or $ Q $, few in each spikelet; 

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

 6 to 12 bristles; stamens 3 to 12; style bifid; achenium lens-shaped 

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

 the style. 2 St. leafy, 3 -sided. Inflor. terminal and axillary. Setae 

 hispid (under a strong magnifier). 



Setae densely plumous. Achenium subglobous-ovoid (terete) Nos. 1, 2 



Setee naked, denticulate or hispid. Achenium more or less flattened. (*) 



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



a Setae shorter than the achenium Nos. 8 5 



a Setae equaling or exceeding the achenium. (b) 



b Spikes in drooping panicles. Achenium oblong No. 6 



b Spikes in erect or spreading panicles. Achenium roundish Nos. 7 9 



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



Acheniuin oval Nos. 12, 13 



* Acheninm smooth/and even. (c> 



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



d Setae 6 to 10, retrorsely hispid (under a strong magnifier) Nos. 14 16 



d Setae 6, upwardly hispid Nos. 1719 



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



e Stamens 3 or 12. Setae 10 or 12 Nos. 20, 21 



6 Stamens 3. Setae 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. plumdsa Ell. Culm rigid, wiry, 8' 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 (setce) 6, 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, nakecl and denticulate above. 

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



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

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

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

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

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



3 R. cyinosa Nutt. Culm 1 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, f as long as the broad ovate, transversely ruguous achenium ; 

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



4 R. Torreyana Gray. Culm 2f high, teretish, slender, caespitous, striate ; Ivs. 

 setaceous, the radical 6 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 short, nearly as broad at base as the achenium. N. 

 J. JL, Aug. (Holton.) 



5 R. rariflora Ell. Culms tufted, 6 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, 18' to 3f high; Ivs. 

 narrowly linear, flat, smooth, half as long as the culm ; spikes lanceolate, fuscous, 

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



