OBJECT LESSONS IN BOTANY. 



lohed leaf (Fig. 32), tlie Mossy-cnp Oak has a lyraU leaf, 



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

 22. Fig. 35 is the leaf of a kind of Milkweed, called Muh 



gedium^ with sharp lobes pro- 

 jecting at right angles to the 

 niidvein ; and Fig. 36 is of the 

 Wild Lettuce, with lobes point- 

 ing or hooking backwards. 

 Such leaves are called riin- 

 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 wav}^ outline, 



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



the West, Jack Oak. 



Fig. 36. Leaf of Lactuca elongata^ or 

 Wild Lettuce. 



LESSON V. 



OTHER FORMS AND FIGURES. 



23. It is now time to learn the difference 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 

 liitherto noticed. We have now before us a compound leaf, 

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

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



22. What of the figure called runcinate? Describe the undulate leaf. 

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

 2.3 What is a simi)lo loaf? A compound leaf? 



