480 
scarcely inflated, ovate-oblong, pointed but not toothed, prominently few-nerved, 
rarely slightly pubescent, equalling or more commonly surpassing the thin sharp 
scale.—Wet woods and grassy places, from our eastern region to Florida and South 
Carolina. 
14. C, Davisii Schw. & Torr. Taller than the last, with broader leaves and a 
laxer habit, smooth throughout: perigynium conspicuously inflated and toothed.— 
Rich woods and meadows, Massachusetts and Minnesota, southward to Georgia and 
Texas, 
+ + Terminal spike normally entirely staminate. 
++ Perigynium not beaked, finely striate, more or less in lated: spikes erect. 
= Terminal (staminate) spike sessile or very nearly so, and oblique. 
15, C. flaccosperma Dewey. Low (3to 5 dm.) glaucous, the culm slender, leaves 
often very broad (4 to 6 mm.) and flat and comparatively short: staminate spike 
springing from the base of the upper pistillate spike, short (often less than the pistil- 
late spike) and oblique: pistillate-spikes 3 to 5, the two uppermost usually together 
at the top of the culm and sessile and the others more or less remote and slenderly 
peduncled, rather densely flowered, about 2 to 2.5 em. long, rust-colored: peri- 
gynium oblong cylindric soft, narrowed to a point, twice or thrice longer than the 
sharp very small scale, (C. microsperma Steud.)—Wet grassy places, Florida to cen- 
tral Texas, 
16. C. grisea Wahl. Habitually somewhat taller than the last, green, leaves flat 
and rather broad (3 to 5 cm.), lax and usually overtopping the culm: staminate 
spikes borne as in No, 15: pistillate disposed as in No. 15, also green, some of them 
occasionally reduced to two or three perigynia: perigynium oblong, pointless, promi- 
nently turgid, all but the lowest longer than the narrow-nerved scale. Moist grounds, 
Canada to Texas and New Mexico ( Wright). 
= = Terminal spike more or less stalked and erect. 
17. C. amphibola Steud. Slender and erect (25 to 50 cm.), often stiff, green, the 
Jeaves scarcely half so wide as in Nos. 15 and 16: spikes slender and loosely flowered: 
perigynium searcely inflated, triangular, oblong, narrowed into a sharp beak-like 
point, 2-ranked on the spike: scales nerveless and long-awned, spreading. (C, grisea, 
var, angustifolia Boott, and var.? rigida Bailey. C. grisea Olney Hall’s Pl. Tex., No. 
741, and var. minor, No, 743. C. eryptandra Olney, Hall’s P). Tex., No. 742.)—Grassy 
places, New Jersey to Florida and Texas. Lower forms with shorter perigynia are 
var. GLOBOSA. (C. grisea, var. globosa Bailey.) 
++ +e Perigynium prominently beaked, prominently few-nerved, not inflated : spikes (in 
ours) flecuose or nodding, linear. 
18. C, debilis Michx. Very slender and diffuse (4 to 6 din. high), with narrow 
soft leaves: pistillate spikes 3 or 4, scattered or the two uppermost contiguous, all 
on filiform stalks of varying lengths, linear (2 to 4 em. long), loosely flowered: peri- 
gynium linear-ovate and very long, twice or more longer than the bluntish very thin 
scale.—South Carolina to central Texas. 
++ ++ +e Perigynium (in ours) very short-beaked and few-nerved, not inflated and firm in 
texture: spikes spreading or erect, heavy. 
19. C.’Cherokeensis Schw. Tall (5 to 7 dm.) and rather stiff, pale throughout, 
the very long pointed leaves rough: pistillate spikes 3 to 12, often 2 or 3 froma 
sheath, scattered along the upper part of the culm, the very uppermost sessile, or 
nearly so; the others variously rather short-peduncled, 2 to 5 em. long and densely 
flowered, pale, often staminate at the apex: perigynium ovate, very few-nerved, the 
short cylindrical beak entire: scale acute and about the length of the perigynium. 
—Banks and woods, Georgia to central Texas, 
