CYPERACK^. (SKDGE FAMILY.) o27 



tubercle flat, conical ; bristles 6, J the len-^tii of tlic 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, 

 (00-3° high) ; leaves pale, narrowly linear; corymbs 2-3, distant, capitate, or 

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

 densely clustered ; scales mucronatc-awned ; nut oval or orbicular, IcTiiicuIar, 

 dark brown, usually i)ale 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 tiie length of tlic nut. 

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



Var. distans. (R. distans, iViz^t.) Every way smaller ; culms (C- 18' iiigh) 

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

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

 twice as long. — Low pine barrens, Florida to North Carolina. Aug. and Sej)t. 



Var. trichoides. Culms (6'- 12' long) i)rostrate, 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. E.. filifolia, Gray. Culms (10-2° 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 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 tiiickcncd edges. 



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

 green, ^rough above; leaves erect, ciliatc-senulatc ; corymb terminal, capitate, 

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

 smooth, compressed, reddish brown, witli a paler disk ; tubercle very short, de- 

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

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

 Nut 1" long. 



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



24. R. alba, Vahl Culms (1°- 2° high) slender, 3-angled above; leaves 

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

 the lower one long-peduneled ; spikes ovate-lanceolate, 1 -flowered; nut obovate, 

 lenticular, twice as long as the compressed subulate tubercle; liristlcs 10-20, 

 riijid as lonir as the nut and tubercle, ciliate at the base. — Wet i^pringy places, 

 Florida, and northward. Aug. and Sept. 



2.5. 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 \°-2° high. 



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

 linear; cdrynibs 4-12, often by pairs, capitate, dark brown; spikes ovatc-lanceo- 



