38 



REPRESENTATIVE PLANTS 



Study of each form. Examine each modification fur- 

 nished, find its peculiar characteristics, decide what leaf 

 part or parts enter into it, and try by careful and thorough 

 investigation to determine what the modification is for. 

 In this connection read about cacti, climbing plants, and 

 insectivorous plants. Draw each modification, naming the 

 parts. 



Table. Make a table embodying the results of 3'our 

 study of leaf modifications, using the following model : — 



Name of Plant 



Name of 

 Modification 



Part of Leaf 



Purpose of 

 Modifications 



Ecology. Leaves are very greatly m(jdified by the 

 nature of the environment. Desert plants have their leaves 

 so changed in form, structure, external covering, time of 

 production, and other characters, as to show in a very 

 marked way the influence of excessive heat and light on 

 leaves. Similarl}^, plants of very wet places show such 

 condition by many peculiarities. Such response to en- 

 vironment gives rise to Ecology. This science is rapidly 

 assuming great importance in the study of plants and their 

 activities. 



6. Broad and Narrow Leaved Evergreens 

 Material. Without much difficulty there may be ob- 

 tained enough specimens of lemon, rubber, and certain fig 

 species from greenhouses and vinca (myrtle) from the open 

 ground, and also pine and spruce, to make a satisfactory 

 study. The pupil should seek further knowledge by look- 

 ing in reference books and examining pictures of tropical 

 plants, especially trees. 



