728 



IOWA DEPARTMENT OF AGRICULTURE 



employed for ready reference in the subsequent discussion of testing 

 particular kinds of seeds. 



The seeds of sand bur (fig. 17, a) have somewhat the appearance of 

 small wheat kernels, usually light brown or straw colored; common in 

 alfalfa seed from the Great Basin region. The spiny burs of this grass 

 reduce the feeding quality of alfalfa hay. 





3k /S5%v 



Fig-. 17. — Noxious weed seeds found in farm seeds (No. 1); a, Sand bur; b, 

 wild oat; c, chess; d, darnel; e, quack-grass; f, dock; g, black bindweed; 

 h, Russian thistle; i, corn cockle; j, white campion; k, bladder campion; 1, 

 night-flowering catchfly; m, cow cockle; n, pennycress; o, field pepper- 

 grass; p, large-fruited false flax; q, small-fruited false flax; r, ball mus- 

 tard; s, black mustard; t, English charlock. (Enlarged and natural size.) 



