180 CYPERACEAE 
11. R. oligantha A. Gra Stem 2-4 dm. tall, capillary: o d or 
few together in a lax clu ster, ellipsoid Or ellipsoid-fusiform 6-8 m 
scales acute or abruptly pointed, 4—6.5 mm. long: perianth -bristles ine EA 
the ene, y plumose below the middle: achene o re 
long, tran nl wrinkled, the tubercle prominent, wit ilated border and 
a con , often acid, sandy soil and REOTA Coastal Plain, Fla. 
to Tex 
12. R. plumosa Ell. Stem 1-3.5 dm. tall, slender and wiry: leaves few: blades 
filiform, dier d selects borne in 2—4 lax clusters, ellipsoid-ovoid, 2.5-3.5 
mm. long: cales s -acuminate or s te, 2. 5-4 mm. lo ong: perianth- 
bristles o nearly or quite to the top, about a s long as the achene or 
or ter: achene mers ea obovoid or broadly oval, fully 1.5 mm, oa ze di 
led, the tubercle depressed-conic, not constricted under bas 
El Coastal Plain, Fla. to La. and N. C.—(W. I.) 
13. R. intermedia Mu E pL Stem 2-7 dm. tall, stout: leaves numer- 
ous: blades 1-2 mm. wide, or less involute: spikelets borne in 4—6 clusters 
i r 
o rrupted te 
e ovoid, 3—4 . long: seales Pipe. 3-5 mm. long: perianth- 
bri s plumose nearly or quite to the top, longer than the achene: achene 
abe 5) abou . long, transversely wrinkled, the tubercle depressed-conic, 
constricted ds ‘the base.—Pinelands, Fla. Reported from Ala. 
14. R. semiplumosa A. Gray. Stem 2.5-7 dm. tall, bright-green: leaf-blades 
1.5-2.5 mm. wide: spikelets dd in a terminal head -like cluster, or some- 
bra 2. a o cluster, fusiform, 4-6 mm. long: scales short-acumi- 
2-8 mm. lon ea 
a cen longer min ae achene: aehene broadly obovoid or orbieular-obovoid, 
about 1.5 mm. long, wrinkled, the tubercle conic, often broadly so, above the 
. annular Pen — Pin elands, Coastal Plain, Fla. to Tex. and Ga.— (W. I.) 
15. R. alba (L.) Vahl. Stem 1-6 dm. tall, pale-green: leaf-blades mostly 
less than 2 mm. wide: spikelets borne in mostly 2—4 dense corymb-like clusters, 
4—5.5 mm. long, narrowly duque hine acute or mucronate, 3.5-5 mm. long, 
white or pale- - een: perianth-bris 9—15 or rarely more, much ais than 
the achene: achene broadly e cllipsoid b ellipsoid- psi fuly 1.5 mm. long, 
pale-brown, constricted at the base, the t bu rele d one-half as long 
as is achene or more.—( WHITE BEAK-R H.)—A Acid bogs, oo M 
Ga. to Ky., Minn., "N Calif., Alas., C eu d Newf.—(W. I., 0. W.) 
16. R. macra (Clarke) Small. Stem 2-8 wel tall, bright-green: leaves mostly 
over 2 mm. wide: spikelets borne in mostl or 2 dense corymb-like clusters, 
4,5—5.5 mm. lone. fusiform: scales mucro A 3—4.5 mm. p ordre 
perianth- -bristles pA 15-24, much longer than the achene: urbinate- 
obovoid, about 2 mm. long, br own, Zo at the esi ae eee conic 
or conic-subulate, about one-half as long the achene. [&. alba macra 
Clarke. |—Wet Oa aie Coastal Plain, Fla. p. Tex. and Ga. 
7. R. capitellata (Miehx.) Vahl. Stem up to 1.5 m. tall, bright-green: leaf- 
blades deep-green, mostly 3 mm. wide or s spikelets borne in few dense 
eorymbose-eapitate, mostly erect, distant, clusters, ellipsoid-ovoid, 3-4 mm. 
long: scales dark-brown, 1.5-3 m long, usually rad pape dedu 
bristles much longer than "the achene: achene obovoid, about 1.5 mm. long, con- 
stricted at the base, dark-brown, the pi subulate iod lanceolate: subulate, 
as long as the achene or nearly so. [E. glom e n U. 5. E ow an 
wet grounds, often acid, ions provinces, Fla. t ex., Mich, and N. B. 
18. R. glomerata (L.) Vahl. Stem up to 2 m. tall, bright-green: leaf-blades 
bright- green, flat, mostly 4—7 mm. wide: spikelets borne in several to ma y 
