148 MORPHOLOGY AND LIFE HISTORY 



(c) Is the branch differentiated into regions? If 

 so, briefly describe. 



(d) Does the branch show a tendency to be dorso- 

 ventral? How do you determine this? 



(e) Do you note, in entire plants, any indications 

 of response to gravity, moisture, or the direction 

 of light? 



2. The Leaves. 



(a) Describe their position on the stem. Is the 

 flat appearance of the stem due to the leaves 

 being opposite, or to the attitude they have 

 assumed as they mature. 



(b) Are the leaves differentiated into petiole, blade, 

 etc.? 



(c) Describe any apparent adjustment or arrange- 

 ment resulting in the most favorable illumina- 

 tion of leaves. 



(d) Describe any variations in the color of the 

 leaves, and endeavor to account for it. 



3. The Roots. 



(a) Is the plant rooted in the soil? 



(b) Do the roots branch? If so, describe. 



(c) Are there any other roots besides those in the 

 soil? If so, describe them, and their location, 

 and suggest any advantage they may be to the 

 plant. 



(d) Make drawings to illustrate all characters 

 observed, including (i) a portion of the leafy 

 branch (X 2) ; (2) a leaf (X 10) ; (3) aerial roots, 

 if any. 



D. Microscopic Characters: 

 i. The Leaf. 



(a) Mount an entire foliage-leaf in water or clear- 

 ing fluid on a slide. Observe under the micro- 



