178 CYPERACEAE 
adii 1.5 mm. long: tubercle conic, about 
s high as wide. 5. R. cymosa. 
Achene eon reseed: constricted under the 
rele. 6. R. compressa. 
Perianth-bristles gem long as the achene or longer. 
Spikelets ovoid to globular, 2-4 mm. long. 
chene not stipi ate. 
with nn or ascending peduncles 
end pedic 
Tuberele not En eto se 
Tubercle depress sed-conic or disk-like. 47. R. saxicola. 
Tubercle conic or E EE 14 to l5 
as long as the achen 
Achene d mo long. 48. R. punctata. 
Achene- 
Periantir bristles A as long 
achene, exceeded 
ually by t tubercle. 
Spikelets uce: tubercle 
blu E achene orbicu- 
lar- n 49. R. microcarpa- 
Sp : uk s e Us B sharp- pointed, 
ne ellipsoid. 50. R. decurrens. 
Perianth: bristles ES longer 
achene and tubercle. 51. R. schoenoides. 
Tubercle setos 
D i —3-flowered. 
erianth- bristles not longer than 
achene and tubercle. 52. R. patula. 
Perianth- bristles longer than the 
achene and tubercle. 
Anon broadly gue void or 
P neus obovoid. 53. R. caduca. 
Ach narrowly obovoid. 54. R. miata. 
Spikelets 5—10- flowered. 55. R. prolifera. 
Cymes with divaricate peduncles and 
pedicels. 6. R. miliacea, 
Achene constricted at the base into a stipe: 
tuber setos 57. R. stipitata. 
Spikelets fusiform "to lanceolate, 4-6 mm. lon 
Le in as ades filiform: achene obovoid : tubercle 
58. R. stenophylla. 
Leaf-blades not filiform : achene linear-ellipsoid 
blanceolate: tubercle setose. 59. R. inexpansa. 
1. R. pared Britton. Stem up to 1.2 m. tall, nearly terete: leaf-blades chan- 
; wide: spikelets in i dense heads, 5-6 mm. long, pale: scales 
d Or slightly dran: achene obov - 
or euneate-obovoid, 2 mm. long, ciliat 
n exceeded by the perio ee the 
tubercle subulate,. fully twice as long a 
achen Ceratoschoenus rue Cha E m] 
—Pineland ponds and pe Coastal Plain, 
—(W. I.) 
E 
Fla. to Miss. and Ga.— 
2. R. corniculata (Lam.) A. Gray. Stem 
up to 2 m. tall, 3-angled: leaf-blades 6—20 
in diffus es, fusiform: 
seales i cus or slightly acuminate: achene 
ellipsoid- par mm. long, nee ex- 
edin UR unequal perianth- 
bristles, the tubercle 1m several pore 
han Hor 
longer t the —( NED-RUSH.)— 
Swamps and wet eon Coastal Plain and a adj. provinces, Fla. to Tex., Mo., 
D a.—A form from the interior, Ala. to Tex., Ark., and Ind., with 
el., and 
ao aceite smaller achenes has been described as A. conniculata. ined r. 
3. R. inundata (Oakes) Fernald. Stem, leaves, and inflorescence resembling 
R. corniculata, but plants loosely PE and widely gregarious: spike- 
