208 CYPERACEAE 
the lateral 8-15 mm. long, 6-7 mm. wide, suborbieular, with 8-20 at length 
widely spreading perigynia: scales light-brownish-tinged except the green 
Nerd perigynium 3 ae long, 2.25 mm. wide, strongly nerved on both sides, 
the body serrulate above.—Acid swampy woods near the ~ Coastal Plain 
and New England Coast, Fla. to Tex. and N. S.—Spr.-early su 
26. C. Ruthii Mackenzie. Culm 3-7 dm. tall, 3 mm. thick at base: leaf-blades 
flat or canaliculate, averaging 3—3.5 mm. wide: epi pp Ua 6, D lower widely 
separate, the lateral subglobose, 3-6 mm. em ng, the terminal 
similar, but longer Duns elavate at base: scales hight reddish- irbrown-tinged , an 
cept the broad hyali argins: perigynium 3.25—3.75 mm. long, 
1.5 m 
nerved Eri: lly, yen ed ventrally, serrulate above.—Wooded a. "Blue 
ge, Ga. to N C.—Sum 
C. angustior Mackenzie. Culm 1.5-6 dm. tall, slender but strict: leaf- 
r canaliculate: spikes > 5, appro oximaté or little (oa the 
milar 
blade 
lateral suborbicular, 4-6 mm. long, 5- 15 flowered, the terminal simi but 
longer a Vie at the base: scales oo green with HEP defined 
midvein and ill-defined margins: perigynium 2.5-3.5 mm. long, mm. wide, 
impre essed-nerved ae ally, A body not pea —Open swampy po va- 
rious provinces, mts. of N. C. to Calif., Wash., Mich., and Newf.—Sum 
VIII. OvatEes Kunth. Densely cespitose or (rarely) with short-prolonged 
rootstocks. Culm triangular. Opaque part of sheaths not. red-dotted or eross- 
rugulose, but sometimes green-striate. Spikes 2 or 3, up t 20, each 
several to many perigynia, the terminal cd 0d the ty pistillate 
Or Jap. simple, the inflorescence varying from capitate to monili- 
fr i i igyni 
ually serrulate on the margins. yle- 
n scarcely thickened. Achene lenticular. 
tigmas 2. 
28. C. scoparia Schk. Com 1. s am, tall, 
—10, 
m wi 
separate: bracts Sea ae scales thin, acute or acuminate, shorter mon 
per igynia: perigynium 4-6.5 mm. long, 1.2-2 mm. wide, appressed, E 
into the serrulate bidentate beak.—Moist soil, various provinces, S. C. to Mo., 
Colo., Ore., B. C., and Newf.—Sum. 
29. C. tribuloides Wahl. Culm 3-10 dm. ey. rather stout, or sometimes slen- 
der, roughish above: leaf Des 2.5-12 mm. wide, the sheaths loose: spikes 
6—20, aggregated or slightly d obovoid or ' turbinate varying to sub- 
orbieular, blunt, 6-12 mm. long, 5-8 wide: perigynium thin, little dis- 
ended over achene, ascen ding or erect, t, 3-5 mm. long, 1-1.5 m m. wide, LÍ 
exceeding the acute lanceolate scale —Wet t meadows, various Sp ee Fla. t 
, Minn., and N. B.—Sum 
