CYPERACEJE. (SEDGE FAMILY.) 555 



23. R. fuscoides, Bcekl. Closely allied to the preceding, but every way 

 smaller ; culms 6' - 18' high, caespitose ; corymbs capitate, bv pairs at the sum- 

 mit of the culm, aud often a distant lateral one ; spikes ovate ; bristles 6, as 

 long as the nut, rarely twice as long. (H. fascicularis, var. distaus, Flora.) 

 Low pine barrens, Florida to North Carolina. July - Sept. 



24. R. brachychaeta, Sauv. Culms caespitose, prostrate, 6' -12' long, 

 setaceous, like the leaves ; corymb solitary, terminal, capitate ; spikes few, 

 pale ; nut minute, orbicular, thrice the length of the 3-6 bristles. (R. fas- 

 cicularis, var., Flora.) Wet pine barrens, West Florida. 



25. R. filifolia, Gray. Culms (l-2high) filiform, erect; leaves seta- 

 ceous; corymbs 2 - 4, distant, capitate ; spikes densely clustered, lanceolate ; 

 nut minute, obovate, lenticular, smooth and shining, twice as long as the com- 

 pressed triangular-ovate ciliate tubercle ; bristles 6, rigid, nearly as long as the 

 nut and tubercle. Margins of pine barren ponds, Florida to North Carolina. 

 July - August. Culm nearly terete. Spikes brown. Nut pale, with thick- 

 ened edges. 



26. R. pallida, M. A. Curtis. Culms rigid, acutely 3-angled, glaucous 

 green, rough above ; leaves erect, ciliate-serrulate ; corymb terminal, capitate, 

 compact; spikes very pale ferruginous, lanceolate, 1 -flowered; nut obovate, 

 smooth, compressed, reddish brown, with a paler disk ; tubercle very short, 

 depressed, apiculate ; bristles 3,. one fifth the length of the nut ; stamens 3 ; 

 style 2-cleft. Wilmington, North Carolina ( Curtis). June. Culm 1 2' - 20' 

 high. Nut 1 " long. 



27. R. gracilenta, Gray. Culms and leaves filiform or setaceous ; cor-, 

 vmbs 2-3, distant, capitate, brown ; spikes densely clustered, ovate-lanceo- 

 late ; nut oval, dull, as long as the slender subulate tubercle ; bristles 6, twice 

 as long as the nut. Wet pine barrens, Florida, and northward. July - Au- 

 gust. Culms 1 - 2 high. 



* * * Nut smooth and even : bristles hispid downward. 



28. R. alba, Vahl. Culms (l-2 high) slender, 3-angled above; leaves 

 narrowly linear or setaceous ; corymbs mostly 2, capitate, white, turning 

 brownish, the lower one long-peduncled ; spikes ovate-lanceolate, 1-flowered; 

 nut obovate, lenticular, twice as long as the compressed subulate tubercle ; 

 bristles 10-20, rigid, as long as the nut and tubercle, ciliate at the base. 

 Wet springy places, Florida, and northward. August- Sept. 



29. R. glomerata, Vahl. Culms (2 -3 high) 3-angled; leaves nar- 

 rowlv linear ; corymbs 4-12, often by pairs, capitate, dark brown; spikes 

 ovate-lanceolate ; nut obovate from a stalk-like base, lenticular ; tubercle sub- 

 ulate, as long as the nut, with its dilated base equalling it in width ; bristles 

 6, stout, nearly as long as the nut and tubercle. Var. PANICULATA. (R. 

 paniculata, Gray.) 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 places, Florida to North Caro- 

 lina, and westward. July- Sept. 



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

 narrowly linear ; corymbs 4-8, mostly by pairs, globose, compact ; spikes nu- 



