CYPERACEAE 175 
wrinkled, slightly margined, somewhat contracted at the base, the tuberele 
subulate, as long as the achene or longer, slightly decurrent.— (BALD-RUSH. )— 
Coastal 
Re 1, and Great Lake Lowland, Ind. and 
2. P. COE rA (C. Wright) Britton. 
Plant 1-7 dm. tall: spikelets ellipsoid- 
suborbieular in pae or much depressed, 
0. n more, rather coarsely 
eolate, te 
as long as the ache ne lightly decurrent. 
[P. corymbiformis Benth.]—Wet pinelands 
and ponds, Coastal Plain, Fla. to La. and Ga.—(W. I.) 
pi P. nitens (Vahl) Wo od. Plant 2-7 dm. pe spikelets pios ib ellipsoid- 
oid, 5—7 mm. long, usually acute: seales mm. long, acute or 
slightly acuminate, appressed, ‘brown: achene oui r in ai or orbicu- 
lar-obovoid, abou poi oarsely m d, often margined, barely con- 
a at th mps, 
lake-shores, and wet gro PM Coastal Plain, "Fla. to Tex. and N. Y., and Great 
Lake Lowland, Ind. and Mi ch 
oo P. ER e. Liebm. Plant mostly 2-5 dm. = o conic- 
oid, 6-8 mm. eng: acuminate: c a ph 5 mm. long, acuminate, 
ae lax, brown nish: e depressed, about 1.5 m pe rod: ST 
late, marginless, the POBRE much depress ar with a ioe tip and very promi- 
nent shoulders.— Wet soil, pen. Fla.—(W. I., Mex.) 
16. RYNCHOSPORA Vahl. Perennial or rarely annual caulescent gre 
garious or tufted herbs. Leaves with narrowly linear, flat, channeled 
volute, filiform, or capillary blades, those of the stem with long sheaths. 
Spikelets mainly globose, ie ellipsoid, or. fusiform, 1-2-flowered or rarely 
d, b min 
few-flowered, borne in ter l and axillary capitate or open, often corymb- 
cymes. Scales ned concave. Perianth of 3—6, or fewer or more, 
barbed or plumose bristles, or obsolete dera mo ary sessile or 
stly 3. Ova 
stipitate: style partly persistent. Stigmas 2. Achene lenticular, sometimes 
very turgid, smooth, cancellate, or Boe d wrinkled, capped or erowned 
with a depressed or elongate tubercle. About 200 species, most abundant in 
warm regions.—Spr.-fall or all year S.—BEAK-RUSHES. 
Style elongate: stigmas much shorter than the style. 
Spikelets in 1-4 dense globose heads. CAPITATAE. 
Mid. 2 panicled clusters: achene capped with a stout 
tuber II. CORNICULATAE. 
Style nore: ee as long as the style or longer. 
Perianth-bristles wanting or very short. III. PUSILLAE. 
Perianth-bristles present and usually well-developed. 
Bristles plumose: achenes wrinkled. IV. PLUMOSAE. 
Bri stles more or less distinctly barbed. V. GLOMERATAE. 
Plant stiffly erect : leaf-blades invalute, thüs BP 
heads short-peduncled or long-peduncled. 1. R. Tracyi. 
