ORDEB 155. CYPBRACE^B. 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, tho 

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

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



14. RHYNCHOSTORA, Vahl. (Gr. puv^of, a beak, tnropd, seed; 

 from the character.) Flowers $ r $ ? > f ew i n each spikelet ; f 

 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. It St. leafy, 3-sided. Inflor. terminal and axillary. Setcc 

 hispid (under a strong magnifier). 



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



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



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



a Setre shorter than the aeheniuin Nos. 35 



a Setce equaling or exceeding the achenium. (b) 



b Spikes in drooping panicles. Achenium oblong No. fi 



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



b Spikes coryinbous 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 Setse 6 to 10, retrorsely hispid (under a strong magnifier). . . .Nos. 14 1G 



d SetiB6, upwardly hispid Nos. IT 19 



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



6 Stamens 8 or 12. Sette 10 or 12 Nos. 20, 2 1 



e Stamens 8. Setae 0, retrorsely hispid, longer than the ach . . .Nos. 22, 23 



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



long as the acheniutn No. 20 



1 R. plumosa 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 ; brislh (setce) G, densely plumous, as long as the globu- 

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



/?. SEMIPLCMOSA. Setae 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, pedicellate, rarely solitary, 

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

 cronate ; setaj 6, as long as tho ach. and short tubercle, plumous below, hispid 

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



3 R. cymosa Xutt. Calm 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, % as long as the broad ovate, transversely ruguous achenium ; 

 tubercle depressed, much shorter than tho achenium. N. J. to La. .11., Aug. 



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

 setaceous, the radical 6 to 10" long, cauline much shorter ; corymbs few-flowered, 

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

 glumes ovate, mucronate, brown ; bristles G, 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 ; setae 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-flowcred, forming several axillary and terminal, rather long, 



