xvi BOUVANY. 
is supported, the petiole; 3. Two little appendages or lobes at or 
near the base of the petiole, the stipules. (Fig. IX.) 
Fig. 1X. Fig. X. 
Fie. [X.—Diagram ee parts of leaf. F 
Fie. X.—Diagram of lobed leaf (pinnately lobed) showing lobes and sinuses. 
Blade.—The blade is always one piece when the leaf is very 
young (i.e., very early in its growth in the bud). In many cases 
it remains so in all its subsequent growth, and is said to be sim- 
ple. Very commonly, however, even in simple leaves the blade has 
branched more or less in its growth, giv- 
ing rise to lobes of various sizes and forms 
(the lubed leaf), The indentation between 
two lobes is termed a sinus (Fig. X). 
When the branching is so profound that 
2 the lobes have become separable leaflets, 
the blade is said to he compound. 
The branches of the blade may radiate 
from a common central point (radiately 
lobed, radintely compound, or, more com- 
Via. XI—Radiately or Monly, polmately lubed, Fig. XI, palmately 
palmately lobed leaf. compound, Fig. XII); or they may grow 
out on opposite sides of an axial portion (pinnately lubed, Fig. X, 
