GRASSES OF IOWA. 



HI 



7. MUHLENBERGIA GRACILIS. 



Muhlenbergia gracilis Trin. Unifl. 193. 1S24. Scribner. Am. Grasses. 

 Bull. U. S. Dept. Agrl. Div. Agros. 7: 117. /. 111. 1900. 



Muhlenbergia gracilis (H B.K.) Trin. Beal Grasses of N. A. 2: 

 242. 1896. 



description. 



Slender Drops eed Grass. 

 A slender but rather rigid, 

 densely caespitose perennial, 1.5- 

 dm. high, with narrow, invo- 

 lute, rigid leaves, and contracted 

 panicles 8-15 cm. long; spike- 

 lets 3-4 mm. long; empty 

 glumes nearly equal in length, 

 the first about one-half as long 

 as the flowering glume, 1- 

 nerved, acute, or erose at apex. 

 the second a little longer than 

 the first, 3-nerved and 3-toothed, 

 rarely entire at the apex ; flower- 

 ing glume pubescent or scabrous 

 on the back, ciliate on the mar- 

 gins; awn flexuous 8-ib mm. 

 long. Dry soils June to Sep- 

 tember. 



distribution. 



loua. Occasionally culti- 

 vated. Ames, cult. (Pammel). 



North America. Texas to 

 Arizona and Mexico, Colorado 

 (Colorado Springs, Tracy) ; 

 Colorado (Vaseyr E. D. Ball, 



o_„„ r. , y. p ir t> 1 Fig. 102. Muhlenbergia gracilis— a, b, 



8 3 oo ft., Ft. Collins, Pammel, emptyglumeanearlyequ J 1;c ^ d pubes ' cent 



334J BoSWOrth's Ranch, Lari- flowering glume. (Diy. of Agros. U. S. Dept. 



mer County, Crandall ; Parry), ° gl ' 

 and Wyoming. 



4. ORYZOPSIS. 



Orvzopsis Michx. Fl. Bor. Am. 1: 51. pi. 9. 1803. Endlicher 



Gen. PI. 87. Bentham and Hooker. Gen. PI. 3: 1142. Hackel in Engler and 



Prantl. Nat. Pflanz. Fam. II. 2: 46. Scribner. Bull. U. S. Dept. Agrl. Div. 

 Agros. 20: 63. /. 41. 



