468 



even in times of drought, and is greedily eaten by all kinds of 

 stock. Stockmen in the north-west esteem it highly, as it furnishes 

 a palatable and nutritious forage, which continues green all summer 

 under all kinds of hard treatment. The dry forage contains nearly 

 19 per cent, of crude protein, so that its value as a flesh former is 

 high, ranking above that of the clovers. 



FIG. 26. Knotweed (Polvgonum 

 aviculare}. 



Polytfonitm eredum (Upright knotweed). A hardy annual knot- 

 weed, widely distributed through the northern States. In the 

 upper prairie region it is highly valued as a forage plant for milch 

 cows. It grows from 10 to 15 inches high, and in rich, moist soils 

 may be cut for hay. The hay is nutritious, containing n per cent. 

 of crude protein. 



Polygonuin sachalincnse (Giant knotweed ; sachaline ; saghalin 

 polygonum). Giant knotweed or sachaline is a hardy herbaceous 

 perennial, 6 to 12 feet high, with strong creeping rootstocks, broad, 

 somewhat heart-shaped, shining leaves nearly a foot long, and 

 small greenish -white flowers appearing late in the season. It has 

 been cultivated for a good many years as an ornamental. Recently 



