295 



Fig. 277. Poa arida Vasey; Britton and Brown, 111. Fl.. 1: 208. 

 Prairie Spear-gkass. — An erect, often rather rigid, stoloniferous 

 perennial 3 to 6 dm. high, with tiat or folded, stiff leaves and nar- 

 row, rather densely flowered panicles 8 to 15 cm. long. — Meadows 

 and low grounds. Northwest Territory to Kansas and Arizona. 

 April-August. 



