22 



OBJECT LESSONS IN BOTimY. 



loled leaf (Fig. 32), the Mossy-cup Oak has a hjraU leaf, 



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

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



gedium^ 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 run- 

 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. 



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 

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

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

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



22. What of tlie figure called runcinate? Describe tlie undulate lea£ 

 What example ? Wliat kind of venation have the last four formB ? 

 33 What is a simple leaf? A compound leaf ? 



