THE BLUE-GRASSES IOl 
tures. In the Northern Rocky Mountain States and 
in the Pacific Northwest many varieties of this 
species are found in the wild state, and they not in- 
frequently appear among the grasses on the farms. 
It is not very highly prized in those regions because 
of its low yield of forage. Alfalfa, timothy, redtop, 
and orchard-grass all do well there, and yield much 
more feed. In a few limited areas in the State of 
Washington, especially in the western part, blue- 
grass is a troublesome weed. The variety found there 
grows very rank, and sends out formidable under- 
ground stems that make it difficult to eradicate. 
Blue-grass is the universal lawn grass in the north- 
ern half of the United States, and it has no equal for 
this purpose where the soil is suitable and there is 
abundant water to keep it green during the summer. 
White clover is usually sown with it in lawns; indeed, 
it does better when mixed with white clover. These 
two plants are especially adapted to each other. The 
clover enriches the soil in nitrogen, greatly to the ad- 
vantage of the grass. 
CANADA BLUE-GRASS (Poa compressa) 
This grass is of interest chiefly from the fact that 
its seed is sometimes used to adulterate the seed of 
Kentucky blue-grass. It has some value for pasture 
purposes on sandy soils in the far North. It also does 
well on poor clay soils where Kentucky blue-grass 
fails. It is also a fairly good lawn grass for dry re- 
gions, but must be kept closely mown. If allowed to 
grow up, its wiry stems, when cut back, leave a coarse, 
hard stubble, very undesirable in a lawn. In color it 
