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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 again to form a net-work. This is 
the forked venation. You will find this sort in nearly all 
the Ferns. 
LESSON ITI. 
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. Represents a branch of Juniper, with awl-shaped leaves (subulate), 
Fig. 8, Leaves of the Fleur-de-lis (/ris); 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. 
18. 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? 
