186 CYPERACEAE 
the tubercle low-conic, much shorter than the achene.—Swamps and shaded 
banks, Coastal Plain and adj. provinces, Fla. to Tex., Ark., and N. C.—(W. I.) 
. mixta Britton. Stem up to 1.5 dm. tall, 3-angled: leaf-blades 3-7 mm. 
ec 
n Or bus eolate in outline, 3-4 m ong: seales short-acuminate or 
ba eronate, 2.5-3.5 mm. long, = own: puo longer than 
pron narrowly obovoid or elli pu about 1.5 mm. long, finely 
the Son 
Bn c wrinkle d, the tubercle conic, often one-half as long as the achene. 
—Swamps and low pinelands, Coastal Plain, Fla. to Tex. and Ga. 
55. R. ee Small Stem 0.5-1 m. tall slender, weak, 3-angled: leaf- 
blades 2—6 mm. wide, flat: D Doe usually 1 n togethe er, 2 several 
corymb-like es flat, ovoid or noar -ovoid, obtuse 
or aeutish, mostly 2-3 mm. long, thin, decidu hg pecie -bristles “fully 
long as the achene: achene broadly o bod to suborbicular, 1-1.5 "long, 
slightly transversely wrinkled, persistent on the rachis, the fines pisi 
somewhat constricted at the base.—River-banks, moist sandy soil, and pin 
M Coastal Plain, Fla. to Miss. and N. C. 
. miliacea (Lam.) A. Gray. Stem up to 1.5 m. tall, de ndr d res 
blades 3-8 mm. wide, flat: “spikelets ages mc eee in mostly 6-8 lax 
eorymb-like cymes with divergent stalks, oid, m. long: s ae dos 
nulate, 1.5-3 mm. long, brown: perianth- bristles ee pons the enn achene 
obovoid, oval, or suborbicular, 1-1.5 m long, transversely wrinkled, pale, 
the tubercle depressed or docu m much shorter than the achene.— 
Caleareous low hammoeks and pond-margins, Coastal Plain, Fla. to La. and 
N. C.—(W. I.) 
57. R. ds c D Stem up to 1 m. tall arching above: leaf-blades 
flat, 4—10 mm. wide: spikelets borne many togethe r in 3-5 more or less nod- 
ding corymb- T cym es, n ed ovoid or broadly fusifor m, 7-8 mm. long, 
brown: scales mucronate, 3.5-7 mm. long, Pp e much longer 
than the a ne: achene ed obov oid, 1.5 ong, finely cT 
wrinkled, tipe-like base, the tubercle dod conie, about one-half 
as long as os "So nis and low pinelands, Coastal Plain, Fla. to 
N. C.—(W. I.) 
2. R. stenophylla Chapm. Stem 1—4 dm. tall, wiry-filiform: e chan- 
led or somewhat involute, very slender: spikelets borne few Boh ds 3 lax 
pun corymb-like cymes, nar ie fusiform or lanceolate in mm. 
long: scales mucronu oO 3—4.5 mm. long, pale-brown: ocu bristles em 
than the achene: ne obov oid. or obovoid- d about 1.5 long, 
transversely wrinkled, the habe is conic, about o alf as lo ome as the - achene. 
—Grassy pinelands, Coastal Plain, Fla. to Ala. and & C.— 
59. R. "PER ees (Miehx.) Vahl. Stem up to 1 m. tall, slender, 3- ey se 
blades flat, 2 mm. wide or less: spikelets borne many togeth er in 1— narro 
nun mately bone. paniele- 2 cymes, fusiform, 5-6 mm. long: ae acumi- 
or slightly müeronulat 2.5-0 mm. long, brown, or reddish-brown: 
s a aban t twice a as long a the achene: e pd ellipsoid 
or linear-ellipsoid, or slightly broaden y upward, abou long, trans- 
versely wrinkled, the "ubere triangular- duele Or M Aum subulate, one- 
half as long as the ene or more.—Damp roadsides and pinelands, Coastal 
Plain and adj. Ben) Fla. to La. and Va. 
17. MARISCUS [Hal.] Zinn. Perennial caulescent, often tall, herbs. 
Leaves few, not erowded: blades elongate, flat, or revolute in age, sometimes 
with spinulose-serrulate margins. Spikelets short, in small clusters which are 
borne in short rigid or long plume-like panicles, with the terminal flower per- 
