Testing Farm Seeds. 



363 



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 culti- 

 vated plant in Europe, 



Fig. 20. — Other weed seeds commonly found in farm seeds (No. 2) : a. Creeping 

 buttercup; b, peppergrass ; c, shepherd's-purse ; d, cinquefoil ; e, hop clover; f, 

 yellow trefoil ; s, bird's-foot trefoil ; h, i and J, wild g-eraniums ; k, stork's-bill ; 1, 

 spurge; m, spiny sida ; n, evening primrose; o, red pimpernel; p, sticktight ; a, 

 forget-me-not; r, s and t, vervain. (Enlarged and natural size.) ' 



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 back- 

 g'round (thus readily distinguished from other seeds) ; common in imported 



