LEAF-FORMS AND FIGURES. 



21 



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

 ed, giving to tliem a kidney-shaped form, that is, reniform^ 

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

 Pennywort (Fig. 24). ^\\.q jpeltate^ or shield-shaped leaf (Fig. 

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

 iole iixed to the under side. See, also, IN^asturtion 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 Pig-weed. 



Fig. 32. Sinnate-lobed leaf of White Oak, 



Fig. 33. Undulate-lobed leaf of Jack Oak. 



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



Fig. 35. Lobed \ci\f of Mulgedlum (Bine 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 simiate- 



2L What is tlie figure of the Liverwort leaf? AYliat Ihe figure of the 

 Maple leaf? What kind of venation have tliese last two? Define the fig- 

 ure of the Wliite Oak leaf. Of the Mossy-cuj) Oak. 



