386 



WEEDS 



m 



FIG 268. Noxious weed seeds found in farm seeds: a, sand bur; b, wild oat; c, chess; 

 d, darnel; e, quack-grass; /, dock; g, black bindweed; h, Russian thistle; i, corn cockle; j, 

 white campion; k, bladder campion; /, night-flowering catchfly; m, cow cockle; n, penny- 

 cress; o, field peppergrass; p, large- fruited false flax; q, small-fruited false flax; r, ball 

 mustard; s, black mustard; t, English charlock. (Enlarged and natural size ) (U. S. D. A. 

 in Fights of the Farmer.) 



