SEDGE FAMILY. 245 
27. Cyperus cylindricus (Ell.) Britton. Pine-barren Cyperus. (Fig. 569.) 
Mariscus cylindricus Ell. Bot. S.C. & Ga. 1:74. 1816. 
Cyperus cylindricus Britton, Bull. Torr. Club, 6: 339. 
187 
‘9. 
Cyperus Torreyi Britton, Bull. Torr. Club, 13: 215. 
1886. 
Perennial by small hard corms, culms slender, 
smooth, usually tufted, 4’-18’ tall, longer than the 
leaves. Leaves smooth, 1//-1}4’’ wide, the longer 
ones of the involucre much exceeding the umbel; 
umibel simple, several-rayed, the rays short, or the 
longer 1/-214’ long, the sheaths 2-toothed; heads 
very dense, cylindric, %’—'%’ long, 2’’-4/’ in di- 
ameter; spikelets 114’’-2’” long, flattish, 1—-2-flow- 
ered, spreading or the lower reflexed; scales green, 
oblong; rachis winged; stamens 3; style 3-cleft; 
achene linear-oblong, 3-angled, apiculate, slightly 
more than one-half as long as the scale. 
In sandy pine barrens and on the sea shore, southern 
New York to Florida, west to Texas, mostly near the 
coast. July—Sept. 
28. Cyperus ovularis (Michx.) Torr. Globose Cyperus. (Fig. 570.) 
Kyllingia ovularis Michx. Fl. Bor. Am. 1: 29. 1803. 
Cyperus ovularts Torr. Ann. Lye. N. Y. 3: 278. 1836. 
Perennial by hard tuber-like corms, stem usually 
strict, smooth, 8/-214° tall, longer than the leaves. 
Leaves smooth, 2//-3/’ wide, the longer ones of the 
involucre much exceeding the umbel; umbel simple, 
few-rayed, the rays rarely more than 21%’ long; 
sheath of the rays truncate or slightly toothed; heads 
globose or sometimes a little longer than thick, 4’/— 
7/’ in diameter, very dense, the spikelets radiating 
in all directions; spikelets 2/’-314’’ long, usually 3- 
flowered, separating from the axis and leaving a scar 
at maturity; rachis winged; scales ovate or ovate- 
lanceolate, obtuse or subacute, green, strongly sev- 
eral-nerved; stamens 3; style 3-cleft; achene linear- 
oblong, 3-angled, 2-3 times as long as thick. 
In dry fields and on hills, southern New York to Flor- 
ida, west to Illinois, Kansas and Texas. July—Sept. 
2g. Cyperus filiculmis Vahl. Slender Cyperus. (Fig. 571.) 
Cyperus filiculmis Vahl, Enum 2: 328. 1806. 
Perennial by hard oblong corms, culm smooth, 
slender or almost filiform, ascending or reclined, 
6’-18’ long, usually longer than the rough-mar- 
gined leaves. Leaves 1//-2’’ wide, keeled, those 
of the involucre, or some of them, much exceeding 
the inflorescence; spikelets densely clustered in 
1-7 globose heads, linear, acute, 5-11-flowered, sub- 
terete or compressed, 214’/-6’’ long, 1’’ wide or 
less, tardily falling away from the axis at maturity; 
rachis wingless; scales ovate, acute or obtuse, pale 
green, strongly 7-11-nerved, appressed; stamens 3; 
style 3-cleft; achene oblong or obovoid, 3-angled, 
obtuse, apiculate, dull gray, two-thirds as long as 
the scale, about twice as long as thick. 
In dry fields and on hills, Rhode Island to Ontario 
and Minnesota, south to Florida, Kansas, Texas and 
northern Mexico. June-Aug. 
