LEAVES 17 
the mid-rib. So long as this is not reached, the leaves are 
said to be simple (figs. 11-14). When, however, the 
blade is split up by incisions which reach the mid-rib, and 
is in consequence divided into a number of leaflets, the 
leaf is said to be compound (figs. 17 and 18). 
Types of Compound Leaves. The two subdivisions 
of net-like veins give rise to two distinct types of compound 
leaves—(i.) Pinnately compound leaves ; (ii.) Pal- 
mately compound leaves. 
Fig. 17.—Compound leaf Fig. 18.—Palm-like leaf of a Virginia 
of a Rose. creeper. 
These types are very common in the New Zealand bush ; 
the Towai and Titoki will furnish examples of (i.) and the 
Puriri and several species of Panax of (11.). | 
In the former, the leaflets are arranged in pairs along 
the mid-rib, each pair springing from approximately the 
same level (fig. 17). In the latter the leaflets, varying in 
number, start from the upper end of the stalk, or from 
what, in a palmately-veined simplé leaf, would be the 
base of the margin (fig. 18). 
B 
