GRASSES OF IOWA. 



205 



1. BOUTELOUA CURTIPENDULA. 



Bouteloua curtipendula Torr. in Emory, Notes. Mil. Recon. 153. 1848. 



Bouteloua curtipendula (Michx ) Torr. Nash in Britton and Brown. 111. 

 Fl. 1: 180. /. -413. 1896. Scribner. Bull. U. S. Dept. Agrl. Div. Agros. 7: 201. 

 /. 195. 1900. (3 ed ) 



Bouteloua racemosa Lag. Watson and Coulter. Gray. Man. Bot. 

 656. pi. 9. 1890. (6 ed.) 



Atheropogon apludioides Muhl. Willd. Sp. 4: 927. 1805. 



Cvnosurus secundus Pursh. Fl. Bor. Am. 728. 1814. 



Chloris curtipendula Michx. Fl. Bor. Am. 1: 59. 1803. 



DESCRIPTION". 



Tall Grama Oats. A 

 densely tufted perennial, I to 

 3 feet (3-9 dm.) high, with 

 numerous (twenty to sixty), 

 usually spreading or reflexed 

 spikes scattered along the 

 common axis, forming a long, 

 somewhat one-sided raceme, 

 8 to 16 inches (20-40 cm.) 

 long. Sheaths loose, sparsely 

 pubescent ; leaf-blades 4 to 

 12 inches (10-36 cm.) long, 

 2 lines (4 mm.) wide, 

 scabrous. Spikes 3 to 8 

 lines (6-16 mm.) long, re- 

 Hexed. Spikelets 3^ to 5 

 lines (7-10 mm.) long; 

 empty glumes unequal, the 

 first awn-pointed, the second 

 acute; flowering glumes 

 about 2 lines (4 mm.) long, 

 with three short awns. Tall 

 Grama Oats is widely distrib- 

 uted in Iowa, occasionally 

 Fig. 144. Bouteloua curtipenduia-a, spike; b, abundant, as on the loess 



epikelet; c. flowering glumes. (Div. Agros. TJ. S. 11 cc t 1 



Dept. Agrl. ) blurts of western Iowa along 



the Missouri and its tributaries. In northern Iowa it is found on 

 moraines and gravelly knolls. An excellent forage grass. 



