ORDER 154 CYPERACE^E. 



365 



2 . latlfolla lialdw. Culm teretish, 2 3f; leaves long, linear; bracts 810, laace- 

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

 decurrent on its 2 edges. Ponds, S. 



14. RHYNCHOSFORA, Vahl. Fls. ? or $ 5 $ , few 

 in each spike. Glumes flattish, loosely imbricated, the 

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

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

 crowned with a tubercle the distinct, bulbous base of 

 the style. U Stems leafy, 3-sided. Inflor. ter- 

 minal and axillary, mostly tawny to brown. 



Setas densely plumous. Achenium roundish-ovoid 



(not flattened) Nos. 13 



Set naked, denticulate or hispid. Achenium more 



or less flattened. ..(*) 



* Ach. transvi-rsely wrinkled. Seise upwardly bearded. 



* Achenium smooth and even., .(c) 



a Setae shorter than the achenium Nos. 4 7 



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



b Spikes in drooping pan cles. Ach. oblong or obovate. Nos. v.'.t 



b Spikes in erect, or spreading panicles. Ach. roundish. . Id VI 



b Spikes coryinbed or fascicled. a; Ach. roiind-v/bovate. . 13. 14 



x Achenium oval. Nos. 15. 16 



c Set:e retrrsely hit-picl. or barbed ( indera mairniner).(d) 

 c Sette upwardly hispid (or almost i.one in No. 29). . .() 

 C Sehe none. Culm and leave? setacious or filiform. 



Sout h Nos. 17, 18 



d Culm and leave* very i-lender, setacious or ttliform.. . 



d Culm wiry and firm, leaves linear. Spikes dark-brown.. Nos. 22, 23 



e Culms stout, 2 3f. Setae and stamens i 12 Nos. 21, 25 



e Culms wiry and (inn, 1 2f. Stamens 3. Setie 6, 3, orO Nos. 26 29 



e Culm and leaves very slender, setaceous or filiform Nos. 30, 31 



1 R. plumosu Ell. Culm and leaves filiform-wiry, erect, 10 18' ; spikelets 



1-flwd.. 1", in small 'ascieles forming a loose ftpike at top, often another below 

 it shorter than the bracts : si-tie (j. as long as the tumid, rugous ach. Dry, N. J. to Fin. 

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



2 K. semlplimiosa (Jr. 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 : seta? fi, feathery below. Barrens, S. 1 2f. 



3 R. ollgitiitlia Or. 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 H. cyntoMa N. Culm acutely 3-angled, 1 3f; leaves linear; spike fascicled, in 



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



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

 j 1C. Torreya.ua Gr. Culm teretish, 1$ 2f; leaves setaceous ; cymes small, several, 



i he lateral on capillary peduncles; ach. oblong-obovate, twice longer than the set;*, 



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

 (J 1C. rariflora Ell. Culms I lifted, 6 16'. filiform, the setaceous leaves mutt sjorti;r ; 



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



rugous, tubercle very short. Barrens, S. 

 % R. inrv p.. lisa Vahl Culm slender, erect 1| 3f; leaves narrow-linear, flat; 



spikes lanceolate, 2-4-ttowered, :)", in several rather large recurved-droopvng panicles : 



sell, oblong, half as long as the setw ; tubercle short. Wet barrens, S. 



.No 



