THE STUDY OF LEAVES. 



217 



2. Presence or absence of a leaf stalk. The shapes of 

 those leaves without stalk to be noted. 



3. Differences in length of leaf stalk in leaves from the 

 same plant to be interpreted with reference to position 

 on stalk. 



4. Differences in degree of greenness. Particular case 

 is those leaves equally green on both sides as compared 

 with those which are lighter on the under side. 



Fig. 83. Leaf of Fig. 84. Leaf of the Beech. Fig. 85. Whorled 



the Privet. Leaves. 



5. Presence or absence of hairs, etc. 



6. Differences in texture, glossiness, efc. 



7. Differences in venation parallel veins and netted 

 veins. 



8. Simple and compound leaves. 



