FESTUCEM 



229 



253. Other economic species of Poa. — Compared 

 with Kentucky blue-grass, the other species of Poa are of 

 slight importance, although Can- 

 ada blue-grass attains some im- 

 portance locally (Par. 35). Of the 

 other species 2 are advertised by 

 seedsmen and are occasionally used 

 in mixtures. 



Canada hlue-grass (Poa corn- 

 pressa L.). — Culms wiry, flattened, 

 with numerous creeping rhizomes, 

 not tufted; panicles narrow, the 

 branches in pairs. This resembles 

 P. pratensis but is bluish green 

 rather than dark green. Cultivated 

 as a pasture-grass. Called also 

 wire-grass and flat-stem. 



Rough - stalked meadow - grass 

 (Poa trivialis L.). — This resembles 

 P. pratensis but differs in the 

 absence of rhizomes and in having 

 scabrous sheaths and a long ligule. 

 Sometimes cultivated as a meadow- 

 grass. 



Fowl meadow-grass (Poa triflora 

 Gilib.; P. serotina Ehrh.). — Culms 

 1 to 4 feet high, tufted but with- 

 out rhizomes; sheaths smooth; 



Fia. 54. Poa pratensis. Plant, X3^; spikelet 

 and floret, X5. 



