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

 Pennywort (Fig. 24). Th& peltate, or shield-shapedleaf (Fig. 

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

 iole iixed 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. 



Bi-pinnatifid leaf of Pig- weed. 

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

 Fig. 83. Undnlate-lobed leaf of Jack Oak. 

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

 Fig.^. 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? Ayhat 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 Mossy-cup Oak. 



