ELEVENTH ANNUAL YEAR BOOK— PART XI 739 



Spurge seeds (fig. 20, 1) are steel gray or dark brown, oval, and some- 

 what 4-angled, the angles lightest colored, a few cross-ridges between the 

 angles, one of the angles bearing a slender, black line; common in Ameri- 

 can red clover seed. 



Spiny sida seeds (fig. 20, m) are brown, rounded on one side, angular 

 on the otht r, and notched at the broader end; common in American- 

 grown red clover seed; the forked, often netted-veined seed vessels 

 (shown at right hand side of figure) sometimes appear in poorly cleaned 

 clover, but are more common in grass seeds. 



Evening primrose seeds (fig. 20, n) are small, reddish brown, and an- 

 gular, prismatic, or curved; the corners are thin-edged, the faces finely 

 grooved; common in timothy and sometimes found in clover seed. 



Red pimpernel seeds (fig. 20, o) are small, 3-angled, and reddish- 

 brown: surface finely roughened or sometimes partly smooth and black; 

 somewhat resemble seeds of sorrel (fig. 19, h) having the chaffy cover- 

 ing; very common in imported clover and alfalfa seeds, often in grass 

 seed. 



Sticktight seeds (fig. 20, p) are small, oval, brown burs having many 

 barbed prickles; when in clover, most of the prickles are usually broken 

 away; when in grass seeds, some or all of the prickles are usually unin- 

 jured; found in red clover, particularly that from Canada, in seed of 

 coarse grasses, millets, cereals, and flax; often in seed imported from 

 Europe. * 



Forget-me-not seeds (fig. 20, q) are small, black, shining, oval, rounded 

 on one face, and angled on the other; common in imported clover and 

 grass seeds. 



Vervain seeds (fig. 20, r, s, and t) are oblong, reddish or dark brown, 

 veined on one side, angled and often gray on the other. One kind (fig. 

 20, r) has a distinct network of ridged veins on the back, the surface 

 between the veins shining; common in European clover and alfalfa seeds. 

 The other two kinds of vervain commonly found in farm seeds have in- 

 distinct veins on the back which is dull, one of them (fig. 20, s) being 

 comparatively broad and brown; the other (fig. 20, t) being slender and 

 lighter, reddish colored; seeds common in American-grown clover seed. 



Catmint seeds (fig. 21, a) are oval, dark reddish brown or darker, 

 smooth and dull, readily distinguished by the two white scar spots, side 

 by side at one end of the seed; common in clover seed, particularly Ca- 

 nadian-grown alsike. 



Healall seeds (fig. 21, b) are light brown, oval, with a characteristic 

 whitish appendage at the pointed end, faint dark lines traversing the 

 faces and edges; one of the commonest impurities of both domestic and 

 imported clover and grass seeds. 



Rough-leaved toadflax seeds (fig. 21, c) are very small, oblong, having 

 a light-brown, wrinkled surface; plants not evidently important, but the 

 seeds, as common impurities of imported clover seed, indicate the foreign 

 origin of the lots containing them. 



