GENUS 2. 



SEDGE FAMILY. 



4. Cyperus filicinus Yahl. Nuttall's Cyperus. 



Fig. 724. 



Cyperus filicinus Vahl, Enum. 2: 332. 1806. 



C, Nuttallii Eddy ; Spreng. Neue Entd. i : 240. 1820. 



Annual, culms slender, tufted, 4'-i8' tall, equalling 

 or often longer than the leaves. Leaves of the invo- 

 lucre 3-5, spreading, the larger often 5' long; umbel 

 simple or slightly compound, 3-7-rayed; spikelets 

 rather loosely clustered, linear, very acute, flat, 

 spreading, i'-ii' long, \"-\\" wide; scales yellowish- 

 brown with a green keel, oblong, acute, rather loosely 

 spreading at maturity; stamens 2; style 2-cleft, its 

 branches somewhat exserted ; achene lenticular, nar- 

 rowly obovate, obtuse or truncate, dull, light brown, 

 one-third to one-half as long as the scale, its super- 

 ficial cells quadrate. 



Salt marshes, Maine to Mississippi. Also in Bermuda. Aug.-Oct. 



5. Cyperus microdontus Torr. Coast Cyperus. 



Fig- 725- 



Cyperus microdontus Torr. Ann. Lye. N. Y. 3 : 255. 1836. 



Annual, similar to the preceding species, culms 

 very slender, tufted, sometimes 20' high, usually 

 lower. Leaves about i" wide, those of the involucre 

 much elongated ; umbel commonly simple, sessile, 

 capitate, or i-6-rayed; spikelets linear, acute, 3 "-9" 

 long, less than i" wide, yellowish-brown ; scales 

 ovate, acute, brownish, thin, appressed when young, 

 spreading at maturity ; stamens 2 ; style 2-cleft, its 

 branches much exserted ; achene lenticular, linear- 

 oblong, short-pointed, light brown, one-half as long 

 as the scale, its superficial cells quadrate. 



In wet soil, on or near the coast, New Jersey to Florida 

 and Texas. Aug.-Oct. 



6. Cyperus paniculatus Rottb. Panicled 

 Cyperus. Fig. 726. 



Cyperus paniculatus Rottb. Descr. & Icon. 40. 1773. 

 Cyperus Gatesii Torr. Ann. Lye. N. Y. 3 : 255. 1836. 



Annual; bright green; culms tufted, slender, 

 5 dm. high or less, bluntly 3-angled. Leaves 

 mostly shorter than the culm, 2" wide or less, 

 sometimes very narrow, those of the involucre 

 3-5, usually much elongated; umbel 2-8-rayed, 

 the rays often 2' long; spikelets linear or linear- 

 lanceolate, 3"-/i" long, about i" wide, greenish- 

 yellow ; scales acute, oblong to oblong-lanceolate ; 

 achene oblong, A" long, about one-half as long 

 as the scale, its superficial cells quadrate. 



^ Moist soil, Virginia to Florida, Arkansas and 

 Texas. Also in tropical America. Aug.-Oct. 



