556 CYPEKACE-E. (sEDGE FAMILY.) 



iiicrous, lam't'oliite-olilidij,', dark brown ; nut hroaiUy ottovate from a stalk-like 

 biise, conii>ios.sc'il, almost truncate at tlio ajM'X, ami much wider tiiau the base 

 of the sul)ulate tulierele ; bristles G, iis Ion;; as tiio nut and tubercle. — Bogs 

 and shadv swam]is, Flori<la, and nortliwanl. July -August. 



§ :i. ILvLosciicENUS. — Pcriaiit/i none. 



31. R. pusilla, (liapni. Culms (G'-12' hi^rh) and leaves bri.-itlc-furm ; 

 corymbs '2-:i, distant, erect-sjireading, tiie upper one compound ; spikes mi- 

 nute, ovate, mostly scattered on the brandies, 3-flowercd ; scales ovate, brown ; 

 nut white, oblong-oi)ovate, conipres.sed-lenticular, ccmtracted at tlie l)ase, trans- 

 versely wrinkled ; tubercle depressed-conical, free at the base. — Margins of 

 ))inc barren )M)nds, Middle and West Florida. June. 



32. R. divergens, Ciiapm. Culms (6'- 12' higii) ami leaves filiform or 

 bri.stle-form ; corymbs 2-3, distant, spreading ; spikes small, scattered, pe<li- 

 celled, 3-llowered ; scales brown, ovate ; nut obovate, biconvex, minutely 

 pitted ; tubercle depressed, sessile, minutely pointed in the centre. — Low pine 

 barrens, Florida to South Carolina. June. 



33. R. Chapmanii, .M. A. Curtis. Culms ( 12' - 20' high) densely tufted, 

 erect, setaceous or filiform, like the short and fiat leaves ; corymb .solitary, 

 terminal, cai)itate ; spikes whitish, lanceolate, densely clustered, 1 -flowered ; 

 scales .5, the uppermost fertile ; nut oval, lenticular, smooth and shining ; 

 tubercle short, sessile, broadly conical; stamens 1-2. — Flat pine barrens, 

 Florida to South Carolina. July - August. 



§ 4. Ckhatoschcenus. — Perlcudh ofi-G brisf/i's: style entire, or sUyhtly 

 2-cleft: tubercle subulate, 2-4 times lonijcr titan the nut. 



34. R. cornieulata, Gray. Culms stout (3°-4° high), 3-augled; leaves 

 flat, scalircnis on the edges (6"- 10" wide) ; corymbs 3- .5, erect, com])Ound ; 

 spikes brown, ovate-lanceolate ; style very long, the lower and persistent por- 

 tion upwardly scabrous ; nut narrowly obovate, smooth, the sides concave and 

 minutely dotted ; bristles 5-6, rigid, smoothish, half as long as the nut ; 

 tubercle subulate, 3-4 times the length of the nut. (Hbynchosi)ora longiro.s- 

 tris, Ell.) — Ponds and ditches, Florida, and northward. July - Sept. — Leaves 

 1°- 2° long. Nut and tubercle nearly 1' long. 



35. R. macrostaehya, Torr., var. patula. Corymbs very large 

 decom])ound, diffn.se ; .style minutely 2-cleft; nut i)roa(lly obovate; bristles 

 slender, twice as long as the nut ; otherwise like the preceding. — Ponds and 

 ditches, Florida. Augu.st. — Culms 3°-4° high. Terminal corymbs often 1° 

 in diameter. 



36. R. cyperoides, Mart. ? Culms (2°- 3° high) nearly terete, straight, 

 like the long narrow erect and channelled leaves; spikes densely clustered in 

 1-6 globular heads, the lateral heads long-pednncled and somewhat corym- 

 bose ; scales about 9 {the fourth fertile), whitish ; style very long, minutely 

 2-cleft; nut obovate, lenticular, obscurely wrinkled, hispid on the margins 

 above, shorter than the 6 slender bristles ; tubercle bristle-awl-shaped, twice 

 as long as the uut. (C. capitatus, Flora.) — Pine barren ponds, Florida, and 

 westward. June - August. — Leaves 2" - 4" wide, as long as the culm. Head 

 composed of 30 or more spikes. Kut and tubercle 3" long. 



