

4 



FUIRENA SIMPLEX. 



Rhizomes usually wanting, and stems tufted. Leaves with 

 well developed, flat, grass-like blades. Glumes with a long 

 squarrose or recurved awn. Achenium nearly sessile. Bristles 

 reaching about to the apex of the achenium, retrorsely barbed. 

 Scale-stalks reaching to the base or middle of the achenium. 

 Scales ovate- oblong, obtuse at the base, with a tendency to 

 become cordate, unusually notched at the obtuse apex. Awn 

 slender, commonly smooth, occasionally retrorsely barbed, some- 

 times fully as long as the body of the scale, sometimes short and 

 minute, arising abruptly from the back of the scale just below the 

 apex. 



Vahl, Enum. PL ii. p. 384 (1806). K squarrosa, Torrey 

 Ann. Lye. Nat. Hist N. Y. ii. p. 252! (1828).* F. squarrosa 

 van aristidata, Torrey, 1. c. iii. p. 291 (1836).* F. Schiedcana, 

 Kunth, Enum. PI. ii, p. 183 (1837), ^^e Boeckeler, Linnaea, 

 xxxvii. p. 105. 



Plant 8-50 cm. in height, prevailingly smooth, and frequently 

 with short thickish leaves. It differs conspicuously from' all the 

 other forms in that the awn rises abruptly, not by a gradual 

 tapering, from the scale. The scales become plump much earlier 

 than in F. squarrosa, so that it is seldom possible to find one that 

 shows the nerves, and when mature they arc uniformly of a pale 

 buff color, while in /^ squarrosa they are commonly chestnut- 

 brown. 



Arkansas (?) (Long's first expedition, James). Indian Terri- 

 tory (?); Canadian River (Rigelow). Texas (Wright No. 718, 

 1849; Lindheimer No. 557,1846); Sutherland Springs (Palmer 

 No, 1335, 1879); Eastern Texas (Hall No. 693. in part, 1872); 

 Fredericksburg (Thurber No. ^2, 1850); Dallas (Rcverchon No, 

 562, 1876; Hempstead (collector unknown). New Mexico (Fend- 

 lerNo. "^jj, 1847). Mexican boundary Survey No. 1523. Herb. 

 BerlandierTexano-MexicanumNo. 3224. Mexico (F. Mueller No. 

 2147, 1853) ; Monclova (Palmer No. 1336, 1880). 



4 Forma MACROSTACHYA (Britt.) 



F, squarrosa var. macrostachya, Britt., Bull. Torr. Bot. Club, xi, 

 p. 87 (1884).* This appears to me to differ from the typical form 



Type specimens examined, f Paper of 1S2S read in 1S26. 



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