CLOVERS AND OTHER LEGUMES 



263 



to your collection made as required in Section 38 ; or the 

 illustrations in Figure 116 may help you in this work. 



By referring to the table which follows, you can de- 

 termine the percentage of each particular weed seed in 

 your sample. For example, suppose you find thirty seeds 



-Seeds of some of the common weeds (many times en- 

 larged) . 



1 , Bracted plantain ; 2, black seeded plantain ; S, rag weed ; 4, ox- 

 eye daisy ; 6, red clover ; 6, catmint ; 7, crab grass ; S, field dodder ; 

 9, sorrel; 10, dog fennel; 11, chickweed; 12, lamb's quarter; 13, green 

 foxtail; i^, prickly sida ; 15, vervain ; ifi, madder; 77, yellow foxtail ; 

 18, clover dodder ; 19, heal-all ; 20, yellow trefoil ; 2J, spurge ; 22, curled 

 dock ; 23, lady's thumb ; 24 and 29, buckhorn, showing two faces ; 26, 

 mustard ; 26, alsike ; 27, ox-tongue ; 28, pigweed ; 29, buckhorn ; 30, 

 Canada thistle ; 31 , campion ; 32, wild geranium ; 33, peppergrass ; 34, 

 camomile ; SB, mallow. 



of buckhorn. According to the table, fifty-seven seeds 

 of this weed make one per cent of a teaspoonful of clover 

 or alfalfa seed. Therefore you have thirty fifty-sevenths, 

 or .526 of one per cent of buckhorn in your sample. If 

 any particular weed seed found in your sample does not 



