CYPERACE^E. (SEDGE FAMILY.) 527 



tubercle flat, conical ; bristles 6, J the length of the nut ; stamens 3. Wet pine 

 barrens, Florida to North Carolina. June -Aug. Leaves 2'- 4' long. Lat- 

 eral corymb (when present) remote. 



21. R. fascicularis, Nutt. Culms obscurely 3-angled, commonly slender, 

 (2-3 high) ; leaves pale, narrowly linear; corymbs 2-3, distant, capitate, or 

 sometimes compound ; bracts conspicuous ; spikes light brown, oblong-ovate, 

 densely clustered ; scales mucronate-awned ; nut oval or orbicular, lenticular, 

 dark brown, usually pale in the middle and on the prominent edges ; tubercle 

 white, broadly or narrowly conical, obtuse, compressed, J - the length of the 

 nut ; bristles 4-6, varying from one half to nearly twice the length of the nut. 



Low pine barrens, Florida to North Carolina. June and July. 



Var. distans. (R. distans, Nutt.) Every way smaller ; culms (6' - 18' high) 

 erect ; corymbs capitate, by pairs at the summit of the culm, and often with a 

 third rather distant lateral one ; spikes ovate ; bristles 6, as long as the nut, rarely 

 twice as long. Low pine barrens, Florida to North Carolina. Aug. and Sept. 



Var. trichoides. Culms (6' - 12' long) prostrate, and, like the leaves, bristle- 

 form ; corymb solitary, capitate ; spikes few ; nut orbicular, three times as long 

 as the 3 -6 bristles. Open pine barrens, West Florida. 



22. R. fllifolia, Gray. Culms (l-2 high) 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 compressed 

 triangular-ovate ciljate tubercle ; bristles 6, rigid, nearly as long as the nut and 

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

 Aug. Culm nearly terete. Spikes brown. Nut pale, with thickened edges. 



23. 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, de- 

 pressed, apiculate ; bristles 3, one fifth the length of the nut ; stamens 3 ; style 

 2-clcft. Wilmington, North Carolina. Curtis. June. Culm 12' -20' high. 

 Nut 1" long. 



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

 ymbs 2-3, distant, capitate, brown ; spikes densely clustered, ovate-lanceolate ; 

 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 and Aug. 



Culms 1- 2 high. 



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



25. 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. Aug. and Sept. 



26 R. glomerata, Vahl. Culms (2 -3 high) 3-angled; leaves narrowly- 

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



