ORDER 154. CYPERACE^E. 



365 



2 D. latifolia Baldw. Culm teretish, 2 3f ; leaves long, linear; bracts 8 10, lance- 



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

 decurrent on its 2 edges. Ponds, S. 



14. RHYNCHOSPORA, Vahl. Fls. $ or $ $ ? , few 

 in each spike. Glumes flatfish, 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 

 the style. 1C Stems leafy, 3-sided. Inflor. ter- 

 minal and axillary, mostly tawny to brown. 



Setae densely plumous. Achenium roundish-ovoid 



(not flattened) Nos. 13 



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 achcninm Nos. 4 7 



a Setse equalling or exceeding the ach. . . (b) 



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



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



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



x Achenium oval. Nos. 15, 16 



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

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

 c Setae none. Culm and leaves setacious or filiform. 



South Nos. 17, 18 



d Culm and leaves very slender, setacious or filiform Nos. 1921 



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



Culms stout, 2 3f. Setae and stamens 612 Nos. 21, 25 



e Culms wiry and firm, 1 2f. Stamens 3. Seta? 6, 3, or Nos. 2629 



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



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



1-flwd., 1", in small fascicles forming a loose f>pike at top, often another l>elow 

 it shorter than the bracts ; setae 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 11. semiplumosa Gr. Culm and leaves rigid, wiry, erect; spike 12", in a 



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

 a broad tubercle ; setae (5, feathery below. Barrens, S. 1 2f. 



3 R. ollgaiitlia Gr. Culm and leaves fililbrm-capillarj-, 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 3f; 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. 



5 1C. Torrcyana Gr. Culm teretish, H 2f; leaves setaceous ; cymes small, several, 



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



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

 G 1C. rariflora Ell. Culms tufted, 6 16', filiform, the setaceous leaves much shorter; 



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



rugous, tubercle very short. Barrens, S. 

 g R. inexpaiisa Vahl. Culm slender, erect H 3f; leaves narrow-linear, flat; 



spikes lanceolate, 2-4-llowered, "", in several rather large recurved-droop>:ig panicles; 



neb. oblong, half as long as the setae ; tubercle short. Wet barrens, S, 



