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minates in the soil and grows sufficient in length to allow it to 

 come in contact with the plant upon which it lives, when it im- 

 mediately sends in its suckers, and thus becomes established upon 

 the plant as though it were a part of the host. 



The dodders contain no chlorophyll, the green coloring matter 

 iound in leaves, and hence cannot make food, that is, make starch 

 out of raw material such as ordinary green leaves do, but must 

 derive nourishment entirely from the host upon which they live. 

 Such plants are called parasitic. 



Cockle Bur (Xanthium canadense.) 

 (U. S'. Dept. Agr.) 



Weed of cornfields and roadsides. 



We have two troublesome dodders in this state, the clover dod- 

 der (Cuscuta epithymum Murr.) on alfalfa and clover, with 

 slender stem with elongated stigmas and field dodder (C. arven- 

 sis) with capitate stigmas. 



HEDGE BINDWEED OB MORNING GLORY (Convolvulus septum L.) 



