Photo: James's Press Agency. 



DODDER (Cuscuta epithymum) 



This flowering parasite may be seen on the furze and ling of the 

 Surrey heaths. The thread-like stems twine round the host plant; 

 they put out small suckers which drive their way through the rind 

 and take what nourishment is required. They bear no leaves, but 

 only the clusters of bell-shaped flowers. 



Photo: J. J. Ward. 



ROOTS OF THE WILD WHITE CLOVER, SLIGHTLY 



ENLARGED, SHOWING THE LITTLE ROOT 



TUBERCLES 



These are swellings which harbour a particular race of 

 bacteria with the power of fixing atmospheric nitrogen. 

 The clover plant benefits by obtaining a supply of nitro- 

 genous compounds, and the soil is enriched on the death 

 of the roots and the rotting of the tubercles. Plants of 

 the cloverfamily have an important effect on soil fertility. 



