CYPERACEAE 183 
mucronate, 3-4.5 mm. long, dark ig. Bur ei -bristles shorter than the 
: achene oval or orbicular- -oval, long or less, the tubercle tri- 
angular, often deltoid.—Low pinelands, et Plain, Fla. to La. and N 
—(W. I.) 
33. R. Wrightiana Boeckl. Stem very slender or filiform, 2-4 dm. long, 
spreading or ee “leaf-blades involute, thus filiform or setaceous: 
spikelets borne n usually 2 or 3 cluster- cymes, fusiform or narrowly ovoid, 
2.5—3 mm. lon cales mucronate, 2.5-3 mm. long, brown, often pale: perianth- 
bristles much nm than the achene: BENE oval or orbi icular- m id, 1-1.5 
mm. long, the tubercle deltoid or depressed. [R. brachychaeta Sauv. ]—Moist 
pinelands and grassy swamps, Coastal Plain, Fla. to N. C—(W. I.) 
34. R. indique Baldw. Stem dud pe to 1.2 m. tall, 3-angled: pos et 
i 4—10 mm. wide: spikelets borne in 4—6 lax eorymb- like clusters, ov 
. long: sea ics eod chestnut- e. 3-8 mm. long: perianth- fans 
m rter than the aehene: achene orbieular- obovoid or oval, 3-4 long, 
smooth, the tubercle d pope ed, with a collar-like base, much Boon m the 
achene. Sa ndy hammocks, sandhills, and scrub, Coastal Plain, Fla. to Miss. 
and N. C. 
35. R. ciliaris (Michx.) C. Mohr. ges stout (2), up to 8 dm. tall, obtusely 
ueous. 
ae in a solitary capitate clus ee scm ovoid, or p n in outline, 
long: scales aristate tipped, Boe: 2.5—4.5 long: perianth- 
bris inh hones than the oval or ees oval, about 1.5 
long, eancellate, the tube ER mere ud much 2 than the achene. 
TR. ‘ciliata Vahl ]—Low pinelands, Coastal Plain, Fla. to Miss. and N. C. 
36. R. Grayi Kunth. ples iced rd 2-7 dm tall, 3-angled: leaf- 
blades bru linear, mostly 2—4 not Ta shi ining: spikelets 
borne in 2—4 loose e e clu P ‘ovoid, 56 mm. long: scales mucronate, 
3-50 m a the 
achene: : achene pen cr DD adly ellipsoid, about 2.5 mm. long, cancellate, 
dark-brow ercle Gar ed-conic, much shorter than the achene.— 
Dry Sinne "Coda Plain and adj. provinces, Fla. to Tex. and N. C. 
37. R. Harv ici i W. Boott. us up to 1 m. tall, 3- Vu ae ee green: leaf- 
blades flat or nearly so, 1.5 wide: spikelets borne in 1-4 capitate cymes 
or oe especially those E he terminal inflorescence in corymb ae cymes, 
ovoid, 2.5-3.5 mm. long: scales aristate-tipped or mucronate, 2-3 m m. long, 
Mun cold icu d odes d uch shorter than "the 
y obovoid or orbie j 
ully 1.5 mm. lon 
brown, the tubercle depressed, with a somewhat sie like base. le Plankii 
Britton nb —Low grounds, Coastal Plain and adj. provinces, Ga. to Tex., Okla., 
and Ark 
orum Britton & Small. Stem up to d l m. tall, sharply 3- 
EET ind eren light. penu leaf-blades flat, 1.5-2 mm. wide: spi ikelets borne 
in several pie pid e globose-ovoid, about mm. sine. the bracts incon- 
icuo ales el E pure 2—2.0 on m 
perianth- ‘pristles En ET r than the achene: ie orbieular- -obovoid, about 
1.5 mm. long, finely e ud light-brown, the tuberele B ud constricted 
at the base.—Pinelands between Myakka prairie and Punta Gorda, Fla. 
39. R. rariflora (Michx.) Ell. Stem filiform, 2-5 dm. long, sometimes reclin- 
ing: As blades involute-filiform or setaceous: spikelets borne in usually 2 
or 3 en corymb-like cymes, ee or ovo 5-3 mm. long: scales 
acute or obtusish, 2-3 mm. lon per d gm shorter than the 
achene: achene obov oid or broadly "ellipsoid, pue 1.5 mm. long, strongly 
transversely wrinkled, the tubercle depressed-conic. —Pinelands, Coastal Plain 
and Piedmont, Fla. to Tex. and N. J.— I.) 
