300 



EXPERIMENT STATION BULLETIN. 



Fig. 19 (20). 



Blue Grass. Flat-stemmed Poa. Wire 

 Grass. Canadian Blue Grass. Poa com- 

 pressa L. Bluish green, stems firm, smooth, 

 much compressed, 30-60 cm. high from creeping 

 rootstocks. Panicle usually contracted, 5-10 

 cm. long. Dry soil, extensively naturalized 

 from Europe. 



The "seeds" are sometimes'used to adulterate 

 those of June grass. Of the smaller details, 

 perhaps the best single one to distinguish this 

 grass from Kentucky blue grass is to be seen 

 in figures of the spikelets, especially the palets. 



Pig. 20 (21). 



June Grass. Kentucky Blue Grass. Spear 

 Grass. Poa pratensis L. A very common 

 and variable widely distributed perennial; 

 stems smooth, scarcely compressed, 10-120 cm. 

 high, from copious running rootstocks; blades 

 more or less compressed unless moist, 5-30, 

 rarely 60-150 cm. long, the edges usually 

 parallel, the apex very abruptly boat-shaped; 

 panicle when open about as wide as high. Very 

 extensively distributed in Europe, Asia, North 

 and South America. 



Our plants in cultivation introduced from 

 Europe. This is one of our worst weeds for 

 the garden and low moist fields in cultivation. 



