WEED IMPURITIES IN AGRICULTURAL SEEDS 



35 



cent of the samples. Slightly different results have been 

 obtained in other localities. The kind of impurity will 

 depend on locality. 



Meadow Fescue: Common Impurities or. Yarrow, 

 Rugel's plantain, sedge, cinquefoil, chess or cheat, 



pepper grass, sorrel, brome 

 grass, orchard grass, velvet 

 grass (quack grass a possi- 

 bility), English ryegrass. 



Kentucky Blue Grass: Com- 

 mon Impurities of. The im- 



Fig. 28. i, three seeds of red , r T^ 1 t_i 



clover; 2, two seeds of sweet P u ties of Kentucky blue 

 clover. (Hillman.) grass are practically the same 



as given for meadow fescue. 



although Kentucky blue grass may contain Canadian 

 blue grass and English blue grass (meadow fescue). 



Alsike: Common Impurities of. Timothy, sheep sor- 

 rel, lamb's quarter, night-flowering catchfly, dooryard 

 plantain, pigweed, pepper grass, red clover, wild clover, 

 five-finger, crab grass, mayweed, curled dock, blue grass, 

 hair grass. Alsike clover is not generally adulterated, but 

 impurities were found as follows in Iowa : Sheep sorrel, 

 86.1 per cent; plantain, 33.3 per cent; Canada thistle, 25 

 per cent ; buckhorn or rib 

 plantain, 11:1 per cent. 



Alfalfa: Common Im- 

 purities of. Green fox- 

 tail, yellow foxtail, red 

 clover, bur clover, barn- 

 yard grass, yellow tre- 

 foil, crab grass, chicory, 

 centaurea, alsike, sweet 

 clover, wild rye, grinde- 



lia, Rugel's plantain, talum); 4, 'sheep sorrel (Rumex Acelo- 

 The chief impurities sella )> with covering; 5, timothy, 

 r j , r ir hulled and unhulled; 6, sweet clover. 



tound in alfalfa are (c. M. King.) 



Fig. 29. Impurities in alsike. i, 

 clover; 

 pepper 



