138 



GRASSES OF IOWA. 



5. MUHLENBERGIA WILLDENOVII. 



Muhlenbergia Willdenovii Trin. Unif. 188. 1824. Watson and Coulter. 

 Gray. Man. Bot. 643. 1890. (6th ed.) Scribner. Grasses of Tenn. Bull. 

 Univ. Tenn. Agrl. Exp. Sta. 7: 68. /. 35. 1894. 



Muhlenbergia tenuiflora (Willd.) B. S. P. Beal. Grasses of N. A. 2: 

 255. 1896. Nash in Britton and Brown. 111. Fl. 1: 144. f. 326. 1896. Scribner. 

 Bull. U. S. Dept. Agrl. Div. Agros. 7: 107. /. 101. 1900. (3ded.) 



Agrostis tenuiflora Willd. Spec. 1:364. 1799. 



Agrostis pauci flora Pursh. Fl. Am. Sept. 1: 63. 1814. 



Fig. 99. Muhlenbergia Willdenovii— a, 

 spikelets with unequal outer glumes; b, 

 flowering glumes and bearded callus. (Div. 

 Agros. U. S. Dept. Agrl.) 



description. 



Slender Muhlenbergia. 

 An erect, simple or sparingly- 

 branched perennial, I to 3 

 feet (3-9 dm.) high, with 

 creeping, scaly rootstocks. flat 

 leaf blades and rather few- 

 flowered, linear panicles, 6 to 

 12 inches (15-30 cm.) long, 

 the branches appressed. Spike- 

 lets 1 1 lines (3 mm.) long; 

 empty glumes slightly unequal, 

 acute, about one-half the length 

 of the flowering glume ; callus 

 bearded; awn slender, about 4 

 lines (8 mm.) long. Rocky 

 woods, July to August. 



Widely distributed in east- 

 ern and central Iowa, but 

 never abundant. 



distribution. 



Iowa . Ames ( Hitchcock, 

 Bessey, Carver) ; Muscatine 

 (Barnes) ; Dallas Center. 920 

 (Rhinehart) Winterset, 260 

 (Carver) ; Muscatine (Rep- 

 pert) ; Iowa City (Hitchcock, 

 Macbride). 



North America. Massachusetts to Ontario, Ohio (Columbus, 

 Sullivant), Minnesota, Iowa, Missouri (Eggert), Texas, Alabama and 

 Virginia. 



