Obdeu 155.— CYPERACE^E. 743 



2 D. latifblia Baldw. Culm tcretcish, stout, 9' to 2f high; lvs. Iroadly linear, 

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

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

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

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



14. RHYWCHOSTORA, Vahl. (Gr. pvv X og, a beak, anopd, seed; 

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

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



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 aud axillary. Seta? 

 hispid (under a strong magnifier). 



S Seta; densely plamous. Achenium subdobons-ovoid (terete) Nos. 1, 2 



§ Set« naked, denticulate or hispid. Achenium more or less flattened. (*) 



* Achenium transversely rugous. Seta? upwardly bearded, (a) 



a Setie shorter than the achenium Nos. S — 1> 



a Setae equaling or exceeding the achenium. (b) 



b Spikes In drooping panicles. Achenium oblong No. 6 



b Spikes in creet or spreading panicles. Achenium roundish Nos. 7 — D 



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



— Achenium oval Nos. 12, 13 



* Achenium smooth and even, (c^ 



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



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



d Seta; 6, upwardly hispid Nos. 17—19 



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



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



« Stamens 3. Setie 6,— retrorsely hispid, longer than the uch. . .Nos. 22, 23 



— upwardly hispid, — shorter than the ach. .Nos. 24, 26 



— long as the achenium No. 26 



1 R. plumbsa Ell. Culm rigid, wiry, 8' to 2f high ; lvs. rigid, involute, seta- 

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

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

 glumes broad-ovate, acute ; bristle (setce) C, densely plumovj, as long as the globu- 

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



ji. sesiiplumosa. Seta) feathery half way up, naked 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 filiform- 

 setaceous lvs. about tho samo 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. cymosa Nutt Culm 1 to 2f high, triangular, angles acute; radical lvs. 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 C, f as long as tho broad ovate, transversely ruguous achenium ; 

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



4 R. Torreyana Gray. Culm 2f high, ieretish, slender, caespitous, striate ; lvs. 

 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 obloni.'- 

 obovate achenium ; tubercle short, nearly as broad at baso 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; glumea 

 ovate, acute ; setae about 6, nearly as long as tho 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, tc-retish, rather rigid, 18' to 3f high; lvs. 

 narrowly linear, flat, smooth, half as long as the culm; spikes lanoeolate, fusoou?, 

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



