62 



MORPHOLOGY, OB COMPARATIVE ANATOMY. 



degree of division of the petiole. They also apply to the bracts, sepals, 

 and all other organs of a leaf-like character. 



Compound leaves are such as have the petiole branched once 

 or more times before it bears blades ; the branches of the petiole 

 are called partial petioles or petiolules, and are often articulated to 

 the main petiole, which in this case is occasionally termed the 

 racliis. Stipels occur at the bases of some partial petioles. The 



Fig. 98. Fig. 99. Fig. 100. 



A bipinnatifid leaf. 



A paripinnate leaf. 



An imparipinnate leaf. 



separate blades of the leaf are called leaflets (folwla), or pinnce. 

 Compound leaves may be classed generally into simply, doubly, 



Fig. 101. 



Fig. 103. 



Fig. 102. 



Fig. 101. A binate or unijugate pinnate leaf. 



Fig. 102. A bipinnate leaf, the pinnse unijugate. 



Fig. 103. A bipinnate leaf, the multijugate pinnae paripinnate. 



