CYPERACE.E. (SEDGE FAMILY.) 553 



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

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

 spikes small, rouud-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 (2-3high); 

 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 (2-3high) erect, nearly terete, 

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

 somewhat glaucous ; corymbs 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 than 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 

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

 small, ovate, crowded ; nut obovate, flattened, strongly wrinkled ; tubercle 

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

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

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

 long, several on a spike. 



14. R. caduca, 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, 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. River banks, 

 South Florida. 



