204 CYPERACEAE 
and open woods in calcareous on various provinces, Ala. to Tex., Nebr., 
Mich., and Maine.—Spr.-early su 
10. C. mesochorea Mackenzie. Culm slender, spreading or reclining, 1.5-10 
dm. tall: leaf-blades 2.5—4 mm. mi usually about half length of culms: 
head ovoid, 10-17 mm. long, 10 m oer. the T bain nsely aggregated: 
often on roadsides, Coastal Plain and adj. provinces, Tenn. to D. C.; becoming 
cL "imtroduczd northward.—Spr.-early su 
II. MurTIFLORAE Kunth. Densely cespitose. Culm sharply triangular. 
Opaque part of sheaths usually transversely rugulose, red-dotted. Spikes 
numerous, small, androgynous or pistillate, but not pnm the lower 
more or less compound. Bracts frequently conspicuous. Perigynium plano- 
convex, not very thiek, yellowish-brown, ap- UZ 
r som 
short-stipitate, sharp-margined, more or less 
nerved, conspicuously rough-beaked, the beak 
bidentate.  Achene lenticular. Stigmas 2. 
Style-base more or less enlarge 
11. C. vulpinoidea Michx. Culm 3-10 dm. 
te 
uous: seales strongly awned: perigynium 2-3 mm. long, narrowly to broadly 
ovate, ascending or spreading at ee tesa sealer and wet meadows, various 
a Fla. to Tex., Ore., Vance., and N. B.—Sum 
12. C. triangularis Boeckl. Culm 3-8 dm. tall, stiff, vir rara e Md 
ad 
blades 2-6 mm. wide: sheaths transversely rugulose: head 3- . long w 
very many s all s spikes, a or less compound a o bracts i  setacoous, 
ju conspicuous: seales awned: per ium 3 mm. long, 2.5 mm. wide.— 
igyni 
W prairies and m E Coastal Plain and adj provinces, Miss. “to Tex., 
Okla., and Ark.—Spr.—early 
13. C. annectens Bicknell. Culm 3-10 dm. tall, stiff, rough above: leaf-blades 
Pg 
2-5 mm. wide: ks dbi diy Sata 8 trongly prolo nged upw dd at 
mouth: head 2 m. long, m r les mpound at base and with very many 
small spikes: peo short,  setaceous, ps egre seales strongly 
perigynium 2.6-3.2 mm. long, di 7—2.25 mm, wide, veless or nearly 
awne 
SO ventrally, [C. mo a (Barratt) Fernald. 1—Fields, mostly east of 
the mountains in non-caleareous districts: frequently introduced, various prov- 
inces, Fla. to Ark., Ia., and Me—Sum 
III. PANICULATAE Kunth. Densely or loosely cespitose. Culm not flat- 
tened. Opaque part of sheaths strongly red-dotted. Spikes numerous, small, 
i or 
compound. Bracts usually inconspicuous. Perigynium thick, -strongly convex 
