556 CYPERACE.E. (SEDGE FAMILY.) 



merous, lauceolate-oblong, dark brown ; nut broadly obovate from a stalk-like 

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

 of the subulate tubercle ; bristles 6, as loug as the nut and tubercle. Bogs 

 and shady swamps, Florida, aud northward. July- August. 



3. HALOSCHOENUS. Perianth none. 



31. R. pusilla, Chapm. Culms (6'- 12' high) and leaves bristle-form; 

 corymbs 2-3, distant, erect-spreading, the upper one compound ; spikes mi- 

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

 nut white, oblong-obovate, compressed-lenticular, contracted at the base, trans- 

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

 pine barren ponds, Middle and West Florida. June. 



32. R. divergens, Chapm. Culms (6'- 12' high) aud leaves filiform or 

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

 celled, 3-flowered ; 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 flat leaves ; corymb solitary, 

 terminal, capitate ; 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. CERATOSCHCENUS. Perianth o/"4-6 bristles: style entire, or slightly 

 2-cleft: tubercle subulate, 2-4 times longer than the nut. 



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

 flat, scabrous on the edges (&"- 10" wide) ; corymbs 3-5, erect, compound ; 

 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. (Rhynchospora longiros- 

 tris, El/.) Ponds and ditches, Florida, and northward. July - Sept. Leaves 

 l-2 long. Nut and tubercle nearly V long. 



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

 decompound, diffuse ; style minutely 2-cleft; nut broadly obovate ; bristles 

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

 ditches, Florida. August. 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-peduncled 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 nut. (C. capitatus, Flora.) Pine barren ponds, Florida, and 

 westward. June - August. Leaves 1" - 4" wide, as long as the culm. Head 

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



