ELEVENTH ANNUAL YEAR BOOK— PART XI 737 



bercles arranged in more or less distinct rows, and is found in both im- 

 ported and domestic clover seed. 



Mouse-ear chickweed seeds (fig. 19, s) are minute, flattened, wedge- 

 shaped, tubercled, and distinctly reddish brown; common in small clover 

 and grass seeds, particularly in alsike and timothy produced in Canada. 

 This is a somewhat insignificant weed of lawns and thin meadows. 



Forked catchfly seeds (fig. 19, t) are very similar to those of white 

 campion (fig. 17, j), 'bladder campion (fig. 17, k), and night-flowering 

 catchfly (fig. 17, 1), but differ in having the tubercles on each face of 

 the seed arranged in a few distinct row r s. These kidney-shaped brown 

 seeds often appear in European-grown red clover and alfalfa seed. 



Creeping buttercup seeds (fig. 20, a) are oval, flattened, brown or red- 

 dish brown, with a lighter rim, and have a prominent, straight, or slightly 

 curved beak; common in imported crimson clover, meadow fescue, and 

 rye-grass seeds. 



Peppergrass seeds (fig. 20. b) are oval, flattened, thin, reddish yellow, 

 and have a curved groove on each face; common, and sometimes abun- 

 dant, in clover and grass seeds, particularly in timothy; a widely distrib- 

 uted annual weed of waysides, gardens, and meadows. 



Shepherd's-purse seeds (fig. 20, c) are minute, reddish yellow, oblong, 

 and flattened, with two more or less distinct grooves on each face; com- 

 mon in seeds of white, alsike, and poorly cleaned red clovers; a cosmo- 

 politan, annual weed. 



n inquefoil seeds (fig. 20, d) are minute, straw colored, oval, and lens 

 shaped, the faces bearing curved and forked ridges; common in alsike 

 clover and timothy. 



Hop clover seeds (fig. 20, e) are minute, elliptical, yellowish, the sur- 

 face smooth and shining; common in poorly cleaned clover seed. The 

 reddish flowers (shown at the right of the figure) are common in imported 

 orchard grass, meadow fescue, and rye-grass seeds. 



Yellow- trefoil seeds (fig. 20, f) are oval with a projecting point on the 

 edge, yellowish brown, or tinged with green. Besides being used as an 

 adulterant of clover and alfalfa seed, some seeds occur incidentally in 

 clover and grass seeds. Mature, black, oval pods or immature green pods 

 are common in coarse grass seeds. The plants are widely distributed 

 here and in foreign countries. 



Bird's-foot trefoil seeds (fig. 20, g) are small, nearly spherical, brown, 

 and often mottled; frequently found in imported clover and alfalfa seeds; 

 a cultivated plant in Europe. 



Wild geranium seeds (fig. 20', h, i, and j) as commonly found in farm 

 seeds represent three kinds of plants. Seeds of one kind (fig. 20, h) are 

 oblong and pitted, having a whitish or light-brown network over a darker 

 brown background (thus readily distinguished from other seeds) ; com- 

 mon in imported crimson clover and coarse grass seeds. Another kind 

 (fig. 20, i) has smaller, smooth, rounded seeds which are often covered 

 by a brown hull bearing several diagonal ridges on each side; often 

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