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. 35 is the leaf of a kind of Milkweed, called Mud- 
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 rwn- 
cinate. The Dandelion has 
also runcinate leaves. When 
a leaf has only shallow lobes, 
Fig. 86. Leaf of Lactuca elongata, or as you see in Fig. 33, it ap- 
eRe PS 86 pears with a wavy outline, 
called undulate. It is a leaf of that beautiful tree called at 
the West, Jack Oak. 
LESSON V. 
OTHER FORMS AND FIGURES. 
28. Ir is now time to*learn the difference between a sim- 
ple and a compound leaf. The s*mple 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 the figure called runcinate? Describe the undulate leaf, 
What example? What kind of venation have the last four forms ? 
23 What isa simple leaf? A compound leaf? 
