528 CYPERACEJE. (SEDGE FAMILY.) 
late; nut obovate from a stalk-like base, lenticular; tubercle subulate, as long as 
the nut, with its dilated base equalling it in width ; bristles 6, stout, nearly aslong 
as the nut and tubercle. — Var. PANICULATA. (R. paniculata, Gray.) Culms 
stout (39 — 49 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 Carolina, and westward. July» Sept. 
27. R. cephalantha, Gray. Culms (2°-3° high) nearly terete ; leaves nar- 
rowly linear; corymbs 4-8, mostly by pairs, globose, compact; spikes numer- 
ous, lanceolate-oblong, dark brown; nut broadly obovate from a stalk-like base, 
compressed, almost truncate at the apex, and much wider than the base of the 
subulate tubercle; bristles 6, as long as the nut and tubercle. — Bogs and shady 
swamps, Florida, and northward. July and Aug. 
$3. HALOSCHCENUS. Perianth none. 
28. R. pusilla, n. sp. Culms (6/—12'high) and leaves bristle-form ; corymbs 
2-3, distant, erect-spreading, the upper one compound; spikes minute, ovate, 
mostly scattered on the branches, 3-flowered ; scales ovate, brown; nut white, 
oblong-obovate, compressed-lenticular, contracted at the base, transversely 
wrinkled ; tubercle depressed-conical, free at the base. — Margins of gene 
ponds, Middle and West Florida. June. 
29. R. divergens, n. sp. Culms (6- 12 high) and leaves filiform or bristle- 
form; corymbs 2-3, distant, spreading; spikes small, scattered, pedicelled, 3- 
flowered ; scales brown, ovate; nut óbovite: biconvex, minutely pitted ; tubercle 
depressed, sessile, minntely pointed in the centre, — Low pine barrens, Florida 
to South Carolina. June. 
30. R. Chapmanii, M. A. Curtis. Culms (19!— 20! high) densely tufted, 
erect, setaceous or filiform, like the short and flat leaves ; corymb solitary, terminal, 
capitate ; spikes whitish, lanceolate, densely clustered, 1-flowered ; scales 5, the 
uppermost fertile ; nut oval, lenticular, smooth and shining; tubercle short, £°8- 
sile, broadly conical; stamens 1-2. — Flat pine barrens, Florida to South Caro- 
lina. July and Aug. 
15. CERATOSCHGNUS, Nees. Honwrp-RUSH. 
Spikes few-flowered. Scales loosely imbricated, the lower ones empty, the 
upper with staminate or abortive flowers. Perianth of 4-6 bristles, which are 
dilated and connate at the base. Stamens 3. Style elongated, entire or 
2-cleft at the apex. Nut compressed, crowned with the persistent and 
_ lower half of the style. — Perennials. Culms jointed, leafy. este 
bes cipe. pon. or clustered in a globose head. 
FA 
