G43 



PRAIRIE SANDGRASS 



Calamovil'fa longifo'lia 



Individual flower groups (spike- 

 lets) 1-flowered, without 

 beards (awnless), flattened, nu- 

 merous, overlapping, up to % 

 in. long 



Lowest (2) spikelet bracts 

 (glumes) unequal, first shorter 

 than second, both rather firm, 

 keeled, pointed, persistent on 

 stalks after " seed " falls 



Outer flower bract (lemma) 

 1-veined, acute, with a basal 

 ring of copious white hairs half 

 its length 



*~ Inner flower bract (palea) 

 about as long as lemma, acute 



Flower head (panicle) pale, 

 smooth, 6 to 18 in. long, nar- 

 row, with erect or ascending 

 branches 



Stems solitary, erect, stout, 

 smooth, leafy 



Leafsheaths numerous, over- 

 lapping, short-hairy at least on 

 margins; leaf blades 8 to 12 in. 

 or more long, inrolled above 

 and long-tapering to tip 



Rootstocks underground, ex- 

 tensive, horizontally creeping, 

 stout, scaly, shining 



Roots fibrous 



