FORMS AND FIGURES OF LEAVES. 



15 



Climbing Fern (Fig. 6). To say nothing of the five veins 

 (which are palmate, as in the leaves of Sweet- gum, Fig. 4 a), 

 you may notice the veinlets, how they fork and run to the 

 margin, without uniting ag^in to form a net-work. This is 

 iheforhed venation. Tou will find this sort in nearly all 

 the Ferns. 



LESSON III. 



FORMS AND FIGURES OF LEAVES. 



13. You have already noticed that the form of the Quince 

 leaf, and of most others, is a thin, flat expansion, presenting 

 a large surface to -the air. A few plants have thick, solid 

 leaves, as the leaves of the Live-forevers and Ice-plants. 



Fig. 7. Eepresents a branch of Juniper, with awl-ahaped leaves (subulate). 

 Fig. 8. Leaves of the Fl^ur-de-lis {Iris) ; they are sword-shaped (ensiform). 

 Fig. 9. Leaves of the Scotch Pine ; they are needle-shaped (acerose). 



Other plants have slender leaves, as the Pines. See Figs. 

 7, 8, and 9. - 



13. What is the general form of leaves ? What plants have thick and 

 solid leaves ? What form of leaves has the Pine ? the Iris? the Juniper ? 



