CYPERACEJE. (SEDGE FAMILY.) 527 
tubercle flat, conical; bristles 6, } 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, 
(29 -39 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, 4 —4 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, Nut.) Every way smaller; culms (6/- 18 high) 
erect; corymbs capitate, by pairs at the summit of the bip: 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. filifolia, Gray. Culms (19—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 torpena, 
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 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-cleft. — 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-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 seid places, | 
Florida, and northward. Aug. and Sept. — 5 
25. 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- mut.— Wet pine barrens, Deine i baa ade Aug.— 
Culms Í TEM ji 
