ORDER 154. CYPERACEJ2. 



365 



2 . latifolia Ilaldw. Culm teretish, 2 3f ; leaves long, linear; bracts 810, lance- 



linear, reddish white, long-pointed; ach. roundish, roughened, dull, the tubercle 

 decurrent on its 2 edges. Fonda, S. 



14. RHYNCHOSFORA, Vahl. Fls. 3 or $ $ $ , few 

 in each spike. Glumes flattisli, loosely imbricated, the 

 lowest small and empty. Perianth of 6 12 setae. Sta. 



3 to 12. Style bifid. Achenium lens-shaped or globular, 

 crowned with a tubercle the distinct, bulbous base of 

 ttie style. U Steins leafy, 3-sided. Inflor. ter- 

 minal and axillary, mostly tawny to brown. 



S^tse densely plumous. Achenium roundish-ovoid 



(not flattened) Nos. 1 :J 



Setae naked, denticulate or hispid. Achenium more 



or less flattened ...(*) 



* Ach. transversely wrinkled. Setae upwardly bearded, (a) 



* Achenium smooth and even. . .(c) 



a Setae shorter than the achenium Nos. 4 7 



a Seta; equalling or exceeding the ach. . . (b) 



b Spikes in drooping panicles. Ach. oblong or obovate.Nos.8,9 



b Spikes in erect or spreading panicles. Ach. roundish.. 10 12 



b Spikes corymbed or fascicled. x Ach. round-obovate . . 13, 14 



x Achenium oval. Nos. 15, 16 



c Setae retmrsely hispid, or barbed (under a magnifier). (d) 

 c Setae upwardly hispid (or almost none in No. 29). . .() 

 c Setae none. Culm and leaves setacious or filiform. 



South Nos. 17, 18 



d Culm and leaves very slender, setacious or filiform 



d Culm wiry and firm, leaves linear. Spikes dark-brown 



e Culms etout, 2 3f. Setae and stamens 612 



e Culm wiry and firm, 1 2f. Stamens 3. Setae 6, 3, or 



e Culm and leaves very slender, setaceous or filiform 



1 R. plumosa EH. Culm and leaves filiform-wiry, erect, 1018' ; epikelets 



1-flwd., 1", in small fascicles forming a loose spike at top, often another below 

 it shorter than the bracts : seise 6, as long as the tumid, rugous ach. Dry, N. J. to Fla. 

 |3. minor. Every way smaller, 5 10': fascicles 2 or 3 ; setae feathery below. S. 



2 R. semiplumosa Gr. Culm and leaves rigid, wiry, erect; spike 1 2", in a 



capitate corymb at top, often a smaller one below ; ach. solitary, tumid, rugous with 

 a broad tubercle ; setae 0, feathery below. Barrens, S. 1 2f. 



3 R. ollgantha Gr. Culm and leaves filiform-capillary, erect, 8 14'; spikes 1 3 



only, fusiform, 3", with 1 long bract ; ach. obovoid ; setae 6, densely feathery. S. 



4 R. cymosa N. Culm acutely 3-angled, 1 2f; leaves linear; spike fascicled, in 



several crowded cymes : ach. broad-obovate, twice longer than the 6 setae, 4 times 



longer than the depressed-conical tubercle. N. J., Pa., and S. 

 R. Torreyana Gr. Culm teretish, 1J 2f; leaves setaceous ; cymes small, several, 



the lateral on capillary peduncles; ach. oblong-obovate, twice longer than the setae, 



thrice longer than the broad tubercle. N. J., and S. 

 6 R. rarlflora Ell. Culms tufted, 6 16', filiform, the setaceous leaves much shorter ; 



epikes 2". scattered in very loose paniculate cymes; ach. round-obovate, strongly 



rugous, tubercle very short. Barrens, S. 

 8 R. inexpaiisa Vahl. Culm slender, erect 1| 3f; leaves narrow-linear, flat; 



spikes lanceolate, 2-4-flowered, 3", in several rather large recnrved-drooping panicles ; 



ach. oblong, half as long as the setae ; tubercle short. Wet barrens, 8. 



