CYPERACEAE | 181 
corymbose-cymose dense pini hor are a nodding, fusiform, 5— 6m 
long: scales dark-brown, , 2.5-5 mm. long: perianth- bristles iu 
longer than the achene: Boe i adly obovoid or pyriform, about 2 mm. 
long, much constricted at “the base, the body thus often orbicular in outline, 
or even wider than high, the tubercle sabes. as long as the achene or 
nearly so. [R. glomerata paniculata (A. Gray) Chapm.]—Swamps, moist 
s and ravines, Coastal Plain and adj. provinces, Fla. to Tex. and Md. 
9. R. leptocarpa (Chapm.) Small. i up to 1 l, light- or pale- 
ns leaf-blades thinnish, 1.5-2.5 mm. wide: PO ees pre usually few 
together, in 3-6 short- stalke d clusters, posu e braets x p tlets n as 
almost hs ilary Eu ellipsoid or Eel soid- fusiform ong: scales 
obtuse dans ery thin, pale- i 1.5-3 mm. long: peres pia 
longer n the achene: 'achen en d, about 1.5 mm. long, pale, slightly 
constricted an b Dus p shining, the tubercle lanceolate-subulate, shorter 
[ &. erata dn Chapm.]—Wet woods and low 
eed roe Plain, ora, to Miss. and S. C. 
20. R. axillaris (Lam.) Britton. Stem stout, up to 1 m. tall: leaf-blades 2-3 
mm. wide, flat: spikelets i in ds large globular eve Coser 1.5-2.5 
, diameter), fusiform, 5-6 mm. long: dark-bro 3—5 mm. b ng: 
aristulate-acuminate: perianth- “bristles larger oe ds HS. tar yn 
ceeding the tubercle: achene globose-obovoid, above the stipe-like base, pe 
2.0 mm. lon oe the tubercle subulate, about as long as. the achene. [. cepha- 
lantha A. Gray.]—Aecid is and swamps, Coastal Plain and adj. provinces, 
Fla. to La. and N. S.—(W. I.) 
21. R. microcephala Britton. Stem slender, up t m. tall: leaf-blades 
Cue ic page ee spikelets aa in several nee a a 
(mos er), fusiform, 3-3.5 ong: seales chest 
bou ee mm. cere nulate: periant- ‘bristles Mes p nger than ps 
achene and tubercle: es Bon oid, abou . lon 28, constricted at the 
base, the tubercle subulate- lanceolate, nii. than “the —Swamps and 
low grounds, often acid, Coastal Plain and adj. provinces, a m La. and N. J. 
22. - ipic Clarke. Stem Psp 1-7 dm. tall: leaf-blades flat, rad 
1-2 wide: ir ds borne few together in 1-3 stiff clusters, ovoid o 
ellipsoid. rs 2-2.5 mm. long, acute at both ends: scales muero nate, 2—4 
long: per erianth- eles longer ihan the achene: achene broadly oval or orbieu- 
lar-oval, 1.5-2 mm. long, not constricted at the base, the cse Ub 
conie, as long as ‘the achene or longer.—Low pinelands, Coastal Plain, Fla. to 
Tex—(W. I. ) | 
s A Stem filiform, 1-2 dm. tall: leaf gos strongly 
volute, very n w: r depu e aged n i ud n 1-3 lax 
d elipsoid often qu 1 , 4—6 m ong, a t bot aude: scales 
mucronate, 2.5-5 mm. long or rarely S pen Bede de longer e thie 
achene: achene narrowly ellipsoid or linear-ellipsoid, about 1.5 long, 
smooth, T tubercle lanceolate, fully one-half as long as the ieu Moist 
pinelands, W Fla. 
24. R. filifolia Torr. Stem 2-6 dm. tall: leaf-blades channeled and involute, 
thus filiform or bristle-like: spikelets borne in usually 2—4 capitate clusters, 
3.5 j 
lanceolate in outline or A di, te, 3-3.5 mm. long: scales acuminate or 
mucronulate, 2-3 mm. long, bro ae tae e d than the 
eS achen ne obovoid, about 1m ong, shining, light-brown, the tuberele 
deltoid to a -lanceolate, iu than the achene. Pinela nd ponds, 
Coastal Plain and adj. provinces, Fla. to Tex. and N. J.—(W. I.) 
25. fusca (L.) Ait.f. Stem 1-6 dm. tall, deep-green: leaf-blades filiform- 
setaceous, T e borne few together in 1—4 rather lax clusters, 
