CYPERACEiE. (SEDGE FAMILY.) 553 



9. R. microcarpa, Baldw. Culms (2° high) erect, slender, nearly te- 

 rete ; leaves narrowly linear; corymbs 4-6, slender, spreading, compound ; 

 spikes small, round-ovate, scattered; nut round-obovate, lenticular, strongly 

 wrinkled, tipped with the very short and broad tubercle; bristles 5-6, as 

 long as the nut. — Varies with the spikes clustered, and the .3 bristles not half 

 the length of the nut. — Margins of ponds, Florida to North Carolina. July - 

 August. 



10. R. inexpansa, Vahl. Culms nearly terete, slender (2°-3°high); 

 leaves narrowly linear ; corymbs 4 - 5, narrow, remote, compound, drooping ; 

 spikes scattered, lanceolate ; nut lanceolate-oblong, compressed, twice as long 

 as the conical-beaked tubercle ; bristles 6, very slender, twice the length of 

 the nut. — Swamps and banks of streams in the middle districts. July- 

 August. 



11. R. decurrens, Chapm. Culms (2°-.3°high) erect, nearly terete, 

 very slender and bending near the top; leaves linear, elongated, flat and 

 somewhat glaucous ; cor_vml)s 5-6, remote, compound, the bristle-like branches 

 spreading or drooping ; spikes (1" long) ovate, scattered, pedicelled; nut ob- 

 ovate, lenticular, slightly wrinkled and pitted ; tubercle compressed, crescent- 

 shaped, with the edges decurrent, ^ the length of the nut ; bristles 6, as long 

 as the nut. — Marshy banks of lakes and rivers, West Florida. June- July. 



12. R. patula, Gray. Culms 3-angled (2° -3° high), slender above; 

 leaves linear; corymbs 3-5, remote, compound, widely spreading; spikes 

 scattered, ovate, on slender stalks; nut round-obovate, lenticular; tubercle 

 flat, conical, half the length of the nut, ciliate on the edges ; bristles 6, rather 

 longer tliau the nut. — Varies with the spikes lanceolate, the narrower nut 

 contracted at the base, and the bristles twice the length of the nut — River 

 swamps, Florida and Georgia. June - July. 



13. R. Elliottii, Dietr. Culm (2°-. 3° high) 3-angled; leaves linear 

 (\"-2" wide); corymbs 3-5, compound, the lower ones remote; spikes 

 small, ovate, crowded ; imt obovate, flattened, strongly Mrinkled ; tubercle 

 broadly conical, flat, \ as long as the nut; bristles 6, strongly hispid, as long 

 as the nut and tubercle. (Scirpus schcenoides, Ell.) — Margins of ponds in 

 the pine barrens, Georgia, Florida, and westward. June - July. — Nuts ^" 

 long, several on a spike, 



14. R. caduea, Ell. Culms stout (3^^- 4° high), 3 angled ; leaves broadly 

 linear (3" -4" wide) ; corymbs 4-6, compound, remote, the branches and 

 short pedicels erect; spikes very numerous, approximate, ovate; scales cadu- 

 cous ; nuts 4 - 8 on the spike, obovate, biconvex, faintly wrinkled ; tubercle flat, 

 conical, ciliate, J as long as the nut ; bristles 6, slender, twice as long as the 

 nut. — Swamps and wet banks of streams. August. — Spikes 2" long. Nut 

 twice as large as in No. 13. 



15. R. stipitata, Chapm. Culms tall (3° -5° high), triangular, bend- 

 ing; leaves linear; corymbs 4-5, compound, drooping; spikes (4" long) 

 ovate-lanceolate, the scales persistent; nuts stipitate, 1 -3 in a spike, roundish, 

 biconvex, finely wrinkled, twice as long as the compressed-conical tubercle ; 

 bristles 6, more than twice the length of the nut; stamens 3. — Ki'er banks, 

 South Florida. 



