18 BUDS AND STIPULES 



a considerable number of Dicotyledonous and Mono- 

 cotyledonous plants, and many ferns. 



A common example occurs in any abandoned field 

 or waste ground bordered by Elm trees. The young 

 plants which shoot up everywhere are not seedlings, but 

 are formed by adventitious buds on the roots of the old 

 trees ; the considerable distance at which they appear 

 from the parent emphasises the great length of the 

 roots. Similarly, when a tree is cut down the ground 

 becomes covered with a thick growth of young shoots, 

 springing up rapidly, at the expense of the nourish- 

 ment stored up in the roots which remain in the 

 ground. Such shoots are also common in Poplars, 

 Limes, many fruit trees, &c. 



Accidental adventive buds are those which appear 

 if the plant is maimed or wounded ; or if a leaf, say of 

 Begonia, is detached from the parent plant and placed 

 on damp earth. 



Goebel, in his recently published ' Organographies 

 figures an interesting case of the growth of a new 

 plant at the end of the stalk of a detached leaf. The 

 plant in question is a garden hybrid belonging to the 

 same family as Gloxinia (fig. 21). The leaf was taken 

 from a plant which was just about to flower, and the 

 adventitious shoot has straightway produced flowers. 



To eradicate Docks from a garden the whole plant 

 must be removed, as adventitious buds will arise on 

 any broken piece of root which is left behind The same 



