CYPERACEAE. 



VOL. I. 



25. Cyperus fercx L. C. Richard. Coarse 

 Cyperus. Fig. 745. 



Cypcrns fcra.v L. C. Rich, Act. Soc. Hist. Nat. 

 Paris i : 106. 17.92. 



Annual, closely related to the preceding 

 species, but with smooth-margined, shorter and 

 broader leaves, those of the involucre some- 

 times but little exceeding the inflorescence, the 

 scales of the spikelets less imbricated. Umbel 

 simple or somewhat compound, often compact, 

 the rays mostly short; spikelets linear, sub- 

 terete, io-20-flowered, 8"- 12" long, about i" 

 thick, falling away from the axis at maturity ; 

 scales ovate-oblong, appressed, slightly or 

 scarcely imbricated, obtusish or acute, rather 

 firm, green and 7-9-nerved on the back, yel- 

 lowish on the sides ; stamens 3 ; style 3-clef t ; 

 rachis broadly winged; achene 3-angled, nar- 

 rowly obovoid, obtuse. 



In wet soil, Massachusetts to Florida. Cali- 

 fornia, and widely distributed in tropical America. 

 Aug.-Oct. 



26. Cyperus Engelmanni Steud. Engelmann's 

 Cyperus. Fig. 746. 



Cyperus Engelmanni Steud. Syn. PI. Cyp. 47. 1855. 



Annual, culms slender, 6'-22 tall. Leaves elongated, 

 2"-3" wide, flaccid, roughish on the margins, those of 

 the involucre 4-6, the longer exceeding the umbel ; 

 umbel often compound, the raylets very short; spikelets 

 often densely crowded, very narrowly linear, subterete, 

 6"-i2" long, 5-i5-flowered ; rachis narrowly winged; 

 scales greenish-brown, oblong, obtuse, thin, faintly 

 3~5-nerved on the back, distant, the successive ones on 

 each side of the spikelet separated by a space of about 

 one-half their length; stamens 3; style 3-cleft; achene 

 linear-oblong, 3-angled, two-thirds as long as the scale. 



In wet soil, Massachusetts to southern Ontario and Wis- 

 consin, south to New Jersey and Missouri. Aug.-Oct. 



27. Cyperus strigosus L. Straw-colored 

 Cyperus. Fig. 747. 



Cyperus strigosus L. Sp. PI. 47. 1753. 



C. strigosits capitatus Boeckl. Linnaea 36: 347. 



1869-70. 

 C. slrigosiis compositus Britton, Bull. Torn Club 



13: 212. 1886. 

 C. strigosus robustior Kunth, Enum. 2: 88. 1837. 



Perennial by basal tuber-like corms, culm 

 rather stout, i-3 tall. Leaves somewhat 

 rough-margined, 2"-$" wide, the longer ones 

 of the involucre much exceeding the umbel ; 

 umbel several-rayed, compound or nearly 

 simple, some of the primary rays often 4'-6' 

 long, their, sheaths terminating in 2 bristles ; 

 involucels setaceous; heads oblong to sub- 

 globose; spikelets flat, linear, 3"-! 2" long, i" 

 wide or less, 7-25-flowered, separating from 

 the axis at maturity; scales straw-colored, 

 oblong-lanceolate, subacute, strongly several- 

 nerved, appressed, or at length somewhat 

 snreading; stamens 3; style 3-cleft; achene 

 linear-oblong, 3-angled, acute, about one-third 

 as long as the scale. 



In moist meadows, swamps or along streams, 

 Maine and Ontario to Minnesota, Florida and Texas. Lank galingale. Nut-grass. Ground-moss. 

 Contains several races, differing in size, length of rays, length and width of spikelets. Aug.-Oct. 



