22 



OBJECT LESSONS IN BOTANY. 



lobed leaf (Fig. 32), the Mossy-cup Oak has a lyrate leaf, 



having its terminal lobe larger than any other (Fig. 34). 

 22. Fig. 85 is the leaf of a kind of Milkweed, called •JfwJ- 



gediwm, with sharp lobes pro- 

 jecting at right angles to the 

 midvein ; and Fig. 36 is of the 

 "Wild Lettuce, with lobes point- 

 ing or hooking backwards. 

 Such leaves are called rv/rir 

 cinate. The Dandelion has 

 also runcinate leaves. When 

 a leaf has only shallow lobes, 

 as you see in Fig. 33, it ap- 

 pears with a wavy outline, 



called undulate. It is a leaf of that beautiful tree called at 



the West, Jack Oak. 



Fig. 36. Leaf of Lactuea elongata, or 

 Wild Lettuce. 



LESSON V. 



OTHER FORMS AND FIGURES. 



23. It is now time to learn the diiference between a sim- 

 ple and a compound leaf. The simple leaf has but one 

 blade, as the Quince leaf, and all the leaves which we have 

 hitherto noticed. We have now before us a corrvpound leaf, 

 one plucked from a Kose-bush (Fig. 39), consisting of several 

 distinct blades on one 'petiole. It has also one pair of stip- 



23. What of the figure called runcinate? Describe the undidate leaf. 

 What example ? What kind of venation have the last four forms ? 

 33. What is a simple leaf? A compound leaf? 



