ELEVENTH ANNUAL YEAR BOOK— PART XI 741 



groove on one face is bordered by a white stripe; the rounded face is 

 crossed near its center by a shallow groove; common in Amrican-grown 

 red clover seed; sometimes found in alfalfa and grass seeds and occa- 

 sionally in imported seed; a common annual plant of light lands. 



Dwarf plantain seeds (fig. 21, f) are light brown, oval, rounded on one 

 face, and broadly grooved on the other; found in crimson clover seed 

 produced in Atlantic Coast states. 



Field madder seeds (fig. 21, g) are oval, gray in having numerous 

 white surface spots, some of the seeds having three frail, whitish teeth, 

 others devoid of the teeth; common in seed of clover, alfalfa, and grasses; 

 confined chiefly to imported seed. 



Cleavers seeds (fig. 21, h) are coarse, circular, one face rounded, the 

 other depressed in the center; the surface is covered with hair-bearing 

 tubercles from which the hairs may be more or less rubbed away; the 

 entire outer surface is sometimes rubbed away, leaving the seed smooth 

 and brown; common in seed of coarse grasses, millets, cereals, and flax; 

 a common impurity of imported seed. 



Seeds of wild corn salad representing two kinds, commonly appear in 

 clover imported from Europe. They are brown, one kind (fig. 21, i) be- 

 ing slenderly oval and nearly smooth, the other (fig. 21, j) being broader 

 and usually more or less covered with white hairs. The presence of these 

 seeds in clover indicates its foreign production. 



Poverty weed seeds (fig. 21, k) are oval and dull brown, straight, or 

 somewhat curved. They occur in alfalfa seed from the Western States; 

 not found in foreign grown seed. 



Black-eyed Susan, or yellow daisy, seeds (fig. 21, 1) are minute, black, 

 prismatic, finely ridged lengthwise, and 4-angled; found chiefly in tim- 

 othy seed. 



Mayweed (dog fennel) seeds (fig. 21, m) are oval or club shaped, straw 

 colored or brown, ridged lengthwise, the ridges more or less distinctly 

 tubercled; very common in both domestic and imported seed of clover 

 and grasses. 



Field camomile seeds (fig. 21, n) are prismatic, some broad and deeply 

 grooved lengthwise, others slender and lightly grooved or smooth; color 

 whitish, light brown, or dark brown; common in domestic and imported 

 clover and grass seeds. 



Scentless camomile seeds (fig. 21, o) are prismatic, the surface rough 

 and black, one face having three prominent brown ribs, the other showing 

 two of these ribs and a partial third rib; common in poorly-cleaned clover 

 seed and grass seed, particularly the seed of sweet vernal grass imported 

 from Europe. 



Corn flower (blue bottle) seeds (fig. 21, p) are easily recognized by 

 the bluish color of the body of the seed and the tawny color of the brush 

 of bristles each bears; common in both domestic and imported coarse 

 seeds, including crimson clover, grasses, cereals, millets, and flax. 



Cat's-ear seeds (fig. 21, q) are slender, reddish brown, rough, and some- 

 times bear a slender beak tipped by a brush of whitish bristles; found in 

 clover seed and grass seed, a common impurity of imported seed. 



