CYPEKACE^. (sedge FAMILY.) 527 



tubercle flat, conical; bristles G, 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, iSTutt.) 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. triehoides. Culms (6' - 12' long) prostrate, and, like the leaves, bristle- 

 form ; corj'mb solitary, capitate ; spikes few ; nut orbicular, three times as long 

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



22. B,. filifolia, Gray. Culms (l°-2° high) filiform, erect ; leaves seta- 

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

 minute, obovate, lentipular, smooth" and shining, twice as long as the compressed 

 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 and 

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



23. E. 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-cleft, — 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. 



» » * ^ut smooth and even : bristles hispid downward. 



25. R. alba, Vahl. Culms (l°-2° high) slender, S-angled above ; leaves 

 narrowly linear or setaceous; corymbs mostly 2, capitate, wliite, 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 (a°- 3° high) 3-angled; leaves narrowly 

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



