FORMS AND FIGURES OF LEAVES. 



15 



Clubbing Fern (Fig. 6). To say nothing of the five vcina 

 (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 

 maigin, without uniting again to form a net-work. This is 

 (ho forked venation. You will find this sort in nearly ail 

 (he 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 



. 1. Hi-presents a branch of. Juniper, with awl-shaped leaves (subulate). 

 Fig. 8. Leaves of the Fleur-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? 



