3 



-^ 



articulated with the ovary, deciduous. Stigmas three, slender. 

 Achenium about as broad as long, sharply and equally trique- 

 trous, mucronate. 



Kfy to the Sj'ecies and Varieties. 



a. Leaves reduced to bladeless sheaths. /". scirpoidea, 



aa. Leaves with well-developed blades, {h). 



Ik Awn arising abruptly from the back of the perianth-scale, just below its 



F. simplex. 



apex. 



■ 



bb. Awn when present borne on the apex of the perianth-scale, which tapers into it. 



c. Bristles reaching at least to the middle of the achenium, retrorsely 

 barbed, {d). 



d. Perianth-scales narrowly to broadly oblong with a slender awn 

 tapering to a minute point. F. squarrosa, 



dd. Perianth-scales rhomboidal or deltoid-ovate with a thick short awn 

 or point. F. squarrosa var, hispida. 



c€, Bristles not exceeding the stipe of the achenium, smooth. Perianth- 

 scales awnlcss or with a mere apiculation. F. squarrosa var. breviseta, 



FUIREXA SCIRPOIDEA. ' 



Rhizome conspicuous, stout, the stems arising from it singly 

 at frequent intervals. Stems slender, about 20-40 cm. in height, 

 unbranched, terminated by 1-3 spikelets. Sheaths 2 cm. long or 

 less, loose, acute, bladeless. Glumes mucronate, the points ap- 

 pressed. Achenium sessile or nearly so by a narrow base- 

 Bristles sometimes reaching the apex of the achenium and re- 

 trorsely barbed, sometimes nearly obsolete. Scales orbicular- 

 oblong, obtuse at the apex or nearly apiculate, minutely scabrous 

 along the upper margin. 



Michaux, Fl. Bor.-Amer. i. p! ly, t. 7 (1803); and other 

 authors. Vaginaria Richardi^ Pers. Syn. PL i. p. 70 (1805); and 



other authors. 



This plant is very distinct from the other species and shows 

 little variation. The structure of the fruit is very similar to that 

 of 7^ sqiianvsa var. breviseta, the bristles being usually longer 

 and barbed, and the stipe of the achenium and the stalks of the 

 scales shorter. 



Georgia (Leconte). Florida (Rugel, Keeler) ; Miami (Gar- 



I 



ber) ; Duval County (Curtiss) ; Lake Monroe (Garber) ; St. Au- 

 gustine (Canby) ; Apalachicola (Chapman, Saurman); Jackson- 

 ville (Curtiss No. 3067). Alabama; Mobile (Mohr). Louisiana; 

 below New Orleans on the Mississippi (Langlois) ; New Orleans 

 (Ingalls), 



\ 



