Ordee 156.— CTPBRACB^. 743 



2 D. latifdlia Baldw. Culm tereteish, stout, 9' to 2f high; Ivs. broadly Imea/r, 

 very long, overtopping (he culm ; invol. 8 to 10-leaved, whitish, becoming duU red 

 at the lose; aoh. roundish in outline (except the tubercle), roughened, dull, tho 

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

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



14. RHYNCHOS'PORA, Valil. (Gr. pvvxog, a beat, ampd, seed; 

 from the character.) Flowers ij or 3 ^ $ , 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. 2f St. leafy, 3 -sided. Inflor. terminal and axillary. Setae 

 hispid (under a strong magnifier). 



I Beta densely plumous. Acheninm subglobous-ovoid (terete) Nes. 1, 3 



§ SetsB naked, denticalsite or hispid. Achenium more or less flattened. (*) 



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



a Setaj shorter than the acheninm Nos. 8 — 5 



a Setse equaling or excceditbg the achenium. (b) 



b Spiltcs 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 



— Achenium oval Nos. 12, 13 



* Achenium smooth and even, (c) 



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



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



d Setffi 6, upwardly hispid Nos. 11—19 



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



e Stamens 8 or 12. Setae 10 or 12 Nos. 20, 21 



e 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. plum6sa 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 ; iristle (seke) 6, densely plumous, as long as the globu- 

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



/?. SEMiPLTJMdSA. Setse 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 Ivs. about the same height ; spikes 2 to 6, pedicdlaie, rarely solitary, 

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

 cronate ; setse 6, as long as the aoh. and short tubercle, plmnous below, hispid 

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



3 R. cyindsa Uutt. Ouim 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. — ^N. J. to La. Jl, Aug. 



4 R. Torreyana Gray. Cuhn 2f high, teretish, slender, ctespitous, striate ; to. 

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

 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. rarifldra EIL Culms tufted, G 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 capUlary; glumes 

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

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

 aspect of a Trichelostylis. 



6 R. inexpdnsa Vahl. Culm slender, teretish, rather rigid, 18' to 3f high; Ivs. 

 nan'owly 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, 



