LEAVES— FORM AND POSITION 



85 



you know of parallel-veined leaves that have lobed or dentate mar- 

 gins ? 60. What becomes of dead leaves ? 61. Why is there 

 no grass or other undergrowth under pine and spruce trees ? 

 62. Name several leaves that are useful for decorations. Why 

 are they useful ? 63. What trees in your vicinity are most 

 esteemed as shade trees ? What is the character of their foliage ? 



64. Why are the internodes so long in water-sprouts and suckers ? 



65. How do foliage characters in corn or sorghum differ when the 

 plants are grown in rows or broadcast ? Why ? 66. Why may 

 removal of half the plants increase the yield of cotton or sugar- 

 beets or lettuce ? 67. How do leaves curl when they wither ? 

 Do different leaves behave differently in this respect? 68. What 

 kinds of leaves do you know to be eaten by insects ? By cattle ? 

 By horses ? What kinds are used for human food ? 69. How 

 would you describe the shape of leaf of peach? apple? elm? 

 hackberry? maple? sweet-gum? corn? wheat? cotton? hickory? 

 cowpea? strawberry? chrysanthemum? rose? carnation? 70. Are 

 any of the foregoing leaves compound ? How do you describe the 

 shape of a compound leaf ? 71. How many sizes of leaves do you 

 find on the bush or tree nearest the schoolroom door ? 72. How 

 many colors or shades? 73. How many lengths of petioles? 

 74. Bring in all the shapes of leaves that you can find. 



Fig. 112. — Cow- 

 pea. Describe 

 the leaves. For 

 what is the plant 

 used? 



