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 colours 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? 



