528 cyperace^e. (sedge family.) 



late ; nut obovatc from a stalk-like base, lenticular ; tubercle subulate, as long as 

 the nut, with its dilated base equalling it in w idth ; bristles 6, .-tout, nearly as long 

 as the nut and tubercle. — Var. panici lata. (R. paniculata, Gray.) Culms 

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

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

 and springy places, Florida to North Carolina, and westward. July-Sept. 



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

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

 ous, lanceolate-oblong, dark brown; nut broadly obovatc from a stalk-like base, 

 ci ui i pressed, 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 aud shady 

 swamps, Florida, and northward. July and Aug. 



§ 3. HALOSCHCENUS. Perianth none. 



28. It. pusilla, n. sp. Culms (6'-12'high) and leaves bristle-form; corymbs 

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

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

 oblong-obovate, compressed-lenticular, contracted at the base, transversely 

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

 ponds, Middle and West Florida. June. 



29. It. diver gens, n. sp. Culms (6'- 12' high) and leaves filiform or bristle- 

 form; corymbs 2 -3, distant, spreading; spikes small, scattered, pedicel led, 8- 

 flowcred ; scales brown, ovate ; nut obovatc, biconvex, minutely pitted ; tubercle 

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

 to South Carolina. June. 



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

 erect, setaceous or filiform, like the short and flat leaves; corymb Military, terminal, 

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

 uppermost 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. IIorned-Ri bh. 



Spikes few-flowered. Scales loosely imbricated, the lower ours empty, the 

 upper with staminate or abortive flowers. Perianth of 4-6 bristles, which are 

 dilated and connate at the base. Stamen-, :i. St\ le 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 corymb, or clustered in a globose head. 



l. C. corniculatus, Nees. Culms Btout (8°-4°high), 8-angled; leaves 

 flat, scabrous on the edges (6"- 10" wide) ; corymbs 8 5, erect, compound ; spikes 

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

 wardly acabrous ; out narrow I v obovatc, smooth, the .-ides concave and minutely 

 dotted ; bristles 5 - 6, rigid, Bmoothish, half as long a- the nut : tubercle subulate, 

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



