SEDGE FAMILY. 



Cyperus cylindricus (Ell.) Britton. Pine-barren Cyperus. 



Mariscus cylindricus Ell. Bot. S. C. & Ga. i: 74. 1816. 

 Cyperns cylindricus Britton, Bull. Torr. Club, 6: 339. 



1879. 

 Cyperus Torreyi Britton, Bull. Torr. Club, 13- 215 



1886. 



Perennial by small hard conns, culms slender, 

 smooth, usually tufted, 4'-i8' tall, longer than the 

 leaves. Leaves smooth, \"-\W wide, the longer 

 ones of the involucre much exceeding the umbel; 

 umbel simple, several-rayed, the rays short, or the 

 longer i / -2>^ / long, the sheaths 2-toothed; heads 

 very dense, cylindric, X / ~/^ / long, 2 // -4 // in di- 

 ameter; spikelets iy"-2" long, flattish, i-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 Cyperu-.. Kig. 570.) 



Kyllingia ovularis Michx. PI. Bor. Am. I 39. 1803. 

 CyJ>erus ovularis Ton. Ann. l.yi: N Y 3 778. i8j& 



Perennial by hard tuber-like conn*, item muillj 

 strict, smooth, V-i% tall, longer than the Intro. 

 Leaves smooth, 2"-3" wide, the longer ones of the 

 involucre much exceeding the umbel; umbel simple. 

 few-rayed, the rays rarely more than JS' loag; 

 sheath of the rays truncate or slightly toothed; bead* 

 globose or sometimes a little longer than thick 

 j" in diameter, very dense, the spikelets radiating 

 in ail directions; spikelets 2"-3#" long, usually j- 

 flowered, separating from the axis and leaving scar 

 at maturity; rachis winged; scales orate 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, southrrn New York to Flor- 



ida, west to Illinois, Kansas and Texas. Juljr-SepC 



29. Cyperus filiculmis Vahl. 



Cyperus fi.liculm.is Vahl, Enum 2: 328. 1806. 



Perennial by hard oblong corms, culm smooth, 

 slender or almost filiform, ascending or reclined, 

 6MS 7 long, usually longer than the rough-mar- 

 gined leaves. Leaves i // -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-ii-flowered, sub- 

 terete or compressed, 2> // -6 // long, i" wide or 

 less, tardily falling away from the axis at maturity; 

 rachis wingless; scales ovate, acute or obtuse, pale 

 green, strongly 7-u-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. 



Slender Cyperus. (Fig. 571.) 



