356 Missouri Agricultural Report. 



common in imported crimson clover and grass seeds; sometimes found in red 

 clover seed. 



Bladder campion seeds (fig. 17, k) are brown or nearly black, flattened, 

 finely tubercled, the tubercles arranged in more or less distinct rows on the 

 sides and in more distinct rows on the edges; occurs frequently in imported 

 grass seed, and is sometimes abundant in seed of red and alsike clovers grown 

 in the Northern States and in Canada. 



Night-flowering catchfly seeds (fig. 17, .1) are similar to the preceding, 

 dark gray or brown, finely tubercled, the tubercles not in distinct rows on the 

 side; very common and often abundant in seed of red and alsike clovers grown 

 in the Northern States and in Canada. Careful comparison of seeds with the 

 illustrations (fig. 17, j, k and 1; fig. 19, t) will enable one to distinguish the 

 similar seeds of this group of weeds. Figure 19, t, shows the seed of the 

 forked catchfly, which is common in low-grade European red clover and alfalfa 

 seed. 



The seeds of cow-cockle (fig. 17, m) are almost perfectly spherical, black, 

 the surface covered with fine tubercular points; very common in seeds of 

 cereals from the West and Northwest; also, in millet and flax seeds, sometimes 

 in imported coarse seeds; broken seeds often occur in alfalfa seed from the 

 Western States, thus indicating its source. 



Pennycress (or Frenchweed) seeds (fig. 17, n) are oval, flattened, brown, 

 and have concentric ridges on the sides; often found in both domestic and 

 imported seed of cereals, clovers, millets and flax. This is a dreaded weed 

 in t e Northwestern States. 



i'ield peppergrass seeds (fig. 17, o) are reddish-brown, oval, smooth, and 

 show a curved line on each side; common in domestic and imported seed of 

 various clovers, grasses and cereals. 



Praise flax seeds (fig. 17, p and q) as found in farm seeds represent two 

 kinds of false flax (plants in no w^ay related to the true flax). Seeds of the 

 large-fruited false flax (fig. 17, p) are light yellow and much larger than those of 

 the other kind; very common in flax seed (hence the common name); also, in 

 millet and sometimes in alfalfa seed; common in coarse farm seeds from Russia. 

 Seeds of small-fruited false flax (fig. 17, q) are much smaller than the others, 

 and darker, being reddish-yellow; common in Canadian red and alsike clovers 

 and timothy seed. 



Ball mustard seeds (fig. 17, r) are unopened, straw-colored, brown or 

 purplish pods, having a network of ridges over the surface and containing a 

 single yellowish seed within; found in seed of cereals, millets and flax; some- 

 times in imported seed. This is a troublesome weed in certain sections of the 

 Northern States. 



Black mustard seeds (fig. 17, s) are small, commonly somewhat oblong, 

 and reddish-brown or dark brown, sometimes gray, surface pitted, due to a net- 

 v\rork of ridges; taste distinctly pungent; sometimes found in clover and grass 

 seeds. 



English charlock, or wild mustard, seeds (fig. 17, t) are almost spherical, 

 slightly variable in size, black, reddish-brown, or sometimes light brown, the 

 surface comparatively smooth, which distinguishes this seed from seed of other 



jt'ards and rape; taste somewhat pungent; a frequent impurity of nearly all 

 : common clover, grass and cereal seeds; sometimes an adulterant of rape 



btOd. 



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

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



