ELEVENTH ANNUAL YEAR BOOK— PART XI 



?31 



Indian (or brown) mustard seeds (fig. 18, a) are oblong-spherical, av- 

 eraging larger than those of charlock, light-reddish brown, the surface 

 having a distinct network of fine ridges; taste not pungent; occuring 

 chiefly in seeds of cereals, millets, and flax; common in imported flax 

 seed; sometimes mixed with rape seed. 



q r s t ^VV 



Fig. IS. — Noxions weed seeds found in farm seeds (No. 2 ) ; a, Indian mus- 

 tard; b, hare's-ear mustard; c, tumbling mustard; d, wild carrot; e, field 

 bindweed; f, flax dodder; jj, clover dodder; h, small-seeded alfalfa dodder; 

 i, field dodder; j, large-seeded alfalfa dodder; k, corn gromwell; 1, rat-tail 

 plantain; m, buckhorn; n> ragweed; o, gum-weed; p, wild sunflower; q, ox- 

 eye daisy; r, Canada thistle; s, bull thistle; t, mild chicory. (Enlarged and 

 natural size.) 



