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, reniform, 

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

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

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

 iole fixed 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 Pig-weed. 



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



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



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



Fig. 85. Lobed leaf of Mulgedium (Blue Milkweed). 



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

 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 the figure of the Liverwort leaf? What the figure of the 

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

 ore of the White Oak leaf. Of the Mossy-cnp Oak. 



