220 CYPERACEAE 
the blades leaf-like. Scales ovate, pointed. Perigynium ascending, oblong, 
labrous, membranous or subcoriaceous, iinely many-striate, rounded at bo th 
ends, suborbicular in cross-section, beakless ' 
or nearly so, the orifice entire or emarginate. 
Achene triangular, apiculate, jointed with 
the style. Stigmas 3. 
75. C. conoidea Schk. Culm 1-7 dm. tall, 
roughened: leaf-blades 2-4 mm. wide: stami- 
t long, usually long- 
peduncled: pisti illate spikes. 1-3, ls 
erect, peduncled, oblong, 0.5-2.5 - long, 
4-5 mm. thick, rather closely 8—25- muud ed. 
a te, acuminate or rough-awned: 
perigy o 
thick, sukorbicular in cros n. : 
-seetion.—Mea P 
ows, mostly in neutral soils, oceasionally in Ws ; 
other types, Blue pude N. C., and various p Va. to Ia., Wis. . and 
Newf.—Spr.—early su 
76. C. amphibola Steud. Culm 2-6 dm. tall, smooth or slightly d dca 
e staminate Man Ta peduncled: pistillate spikes 2—4, erect, 1—2.5 
. long, 2.5—4 thick, eun ud flo Mia Dd separated, ‘the oe 
often nearly b "and n ong pedi m pedun scales ovate, : peri 
gynium firm, 3.5-4.5 m e ng, thick, cud but be ee “Dry i 
woodlands, in id soils, Coastal Plain and adj. provinces, Fla. to Tex., Mo., 
and W N. J.— —BSpr.-early su 
77. C. grisea Wahl. Culm 2-8 dm. tall, stoutish, slightly roughened above: 
staminate spike sessile or very short peduncled: pistillate spikes 3—5, 7—25 mm. 
long, 4-7 mm. thick, closely 4—15-flowered, widely separated, but the lower 
not nearly basal, the lower at least long- peduneled: scales ovate, cuspidate or 
awned : perigynium about 5 mm. long, 2 mm. thick, vai ng at apex, beak- 
less.—Rieh woods and thickets, in Eie or neutral soils, various pro- 
vinces, Ga. to Tex., Minn., and Me.—Spr.-early sum. 
78. C. glaucodea Tuckerm. Culm 1-6 dm. tall, smooth: Pd e 3-10 mm 
wide, often rather rigid, the bi usually shorter than staminate 
spike 10-25 mm. long, sessile to strongly peduncled: pic ate spikes 3 
1-4 em. long, 5 mm. thick, erect, widely separate, the lower slender ‘peduneled 
scales ovate, acute to awned: perigynium oblong- elliptic, 1.5-1.7 thie 2 
beakless. — Fie lds and Se in clayey places, various inm N. 
Ark., Ill, and Ont.—Spr.-early sum. 
9. C. flaccosperma Dewey. Strongly resembling C. glaucodea, but rather 
lens glaucous: culm 1.5-6 dm. tall, smooth: leaf-blades 4-18 mm. wide, thin, 
not rigid, the basal rather shorter ‘than e culm: staminate spike 10-25 mm. 
long, sessile » strongly peduneled: d spikes 2—5, 1—3.5 em. long, 4.5—6 
. thick, erect, widely separated, the low r slender-peduncl ed: seales ovate, 
acute to awned, often reddish brown tinged: perigynium ovoid-elliptic, 2-2. 25 
mm. thick, beakless.—Moist clayey places in fields and oe Coastal Plain 
and adj. provinces, Fla. to Tex., Mo., and N. C.—Spr.—early su 
XXI. GRACILLIMAE Carey. Culm slender, leafy. Leaf blades flat. Ter- 
minal spike gynaecandrous or sometimes staminate. Lateral spikes 2-4, elon- 
