LEAF-FORMS AND FIGURES. 



21 



ear). In some leaves these lobes are very broad and round- 

 ed, giving to them a kidney-shaped form, that is, remform^ 

 as you see in this Wild Ginger leaf (Fig. 23), and in the 

 Pennywort (Fig. 24). The^^Z^^^^^, or shield-shaped leaf (Fig. 

 25 — another Pennywort) has its base lobes united, and its pet- 

 iole lixed to the under side. See, also, Nasturtion leaves. 



21. We will next study a class of forms with deeply lobed 

 or cleft blades, not well filled up between the veinlets. 



Fig. 31. Bi-pinnatifid leaf of Pipf-weed. 



Fig. 32. Sinuate-lobed leaf of White Oak. 



Fig. 83. Undnlate-lobedleaf of Jack Oak. 



Fig. 34. Lyrate leaf of Moss-cnp Oak. 



Fig. 35. Lobed leaf of Mulgedium (Blue Milkweed). 



First, look at this Liverwort leaf (Fig. 30). It is cleft id 

 two places, rendering it three-lobed. The Sweet-gum leaf 

 (Fig. 4 a) is five-lobed Oak leaves are lobed in many pat- 

 terns, according to the kind. The White Oak has a sinuate- 



21. What is tlie figure of tlie Liverwort leaf? What the figure of the 

 Maple leaf? What kind of venation have these last two? Define the fig. 

 ure of the White Oak leaf. Of the Mossjr-cup Oak. 



