528 cvPERAcn^. (sedge family.) 



late ; nut obovate from a stalk-likc base, lenticular ; tubercle subulate, as long as 

 the nut, with its diluted base equallinji it in width ; bristles 6, stout, nearly as long 

 as the nut and tubercle. — Var. paniculata. (R. paniculata, Cm^.) Culms 

 stout (3°- 4° high) ; leaves flat (2" -3" wide) ; corymbs compound, paniculate, 

 with the very numerous spikes clustered at the summit of the branches. — Bogs 

 and springy ])laces, Fk)rida to North Carolina, and westward. July -Sept. 



27. R. cephalantha, Gray. Culms (2° - 3° high) nearly terete ; leaves nar- 

 rowly linear; corymbs 4-8, mostly by pairs, globose, compact; spikes numer- 

 ous, lanccolate-olilong, dark brown ; nut broadly obovate from«a stalk-likc base, 

 compressed, almost truncate at the apex, and much wider than the base of the 

 subulate tubercle; bristles 6, as long as the nut and tubercle. — Bogs and shady 

 swami)s, Florida, and northward. July and Aug. 



§ 3. HALOSCHCENTJS. Perianth none. 



28. R. pusilla, n. sp. Culms (6'-12'high) and leave*? bristle-form ; corymbs 

 2-3, distant, erect-spreading, the upper one compound; sjiikes minute, ovate, 

 mostly scattered on the branches, 3-flowered; scales ovate, brown; nut white, 

 oblong-obovatc, compressed-lenticular, contracted at the l)asc, transversely 

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

 ponds, Middle and West Florida. June. 



29. R. divergenSj n sp. Culms (6' -12' high) and leaves filiform or bristle- 

 form; corymbs 2-3, distant, spreading; spikes small, scattered, pediccllcd, 3- 

 flowercd; scales brown, ovate; nut obovate, biconvex, minutely pitted ; tubercle 

 depressed, sessile, minutely pointed in the centre. — Low pine barrens, Florida 

 to South Carolina. June. 



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

 erect, setaceous or filifomi, like the short and flat leaves ; corymb solitary, tefminal, 

 capitate; spikes whitish, lanceolate, densely clustered, 1 -flowered; scales 5, the 

 uppennost fertile ; nut oval, lenticular, smooth and shining ; tubercle short, ses- 

 sile, broadly conical ; stamens 1-2. — Flat pine barrens, Florida to South Caro- 

 lina. July and Aug. 



15. CERATOSCHCENUS, Nees. IIoknkdRush. 



Spikes f.w-flowered. Scales loosely imbricated, the lower ones empty, the 

 upper witii staminate or abortive flowers. Perianth of 4-6 bristles, wliich are 

 dilated and connate at the base. Stamens 3. Style elongated, entire or slightly 

 2-cleft at the apex. Nut compressed, crowned with the persistent and hispid 

 lower half of the style. — Perennials. Culms jointed, leafy. Spikes scattered 

 in an open coryml), or clustered in a globose head. 



1. C. COrniculatllS, Nees. Culms stout (3° -4° high), 3-angled; leaves 

 flat, scabrous on tlie edges (6"- 10" wide) ; corymbs 3 -5, erect, compound ; spikes 

 brown, ovate-lanceolate ; style very long, the lower and persistent portion up- 

 wardly scabrous ; nut narrowly obovate, smooth, the sides concave and minutely 

 dotted ; liristlcs 5 - fi, rigid, smootliish, half its long as the nut ; tubercle subulate, 

 3-4 times the length of tiic nut. (Rhynchospora longirostris, Ell.)' — Ponds 



