432 COMPOUND LEAVES. 



with numerous angles or ridges, and as many hollows or chan- 

 nels betwixt them. 



18. Carinate, heeled;, when the prone part of the disk is pro- 

 minent longitudinally. 



19. Membranaceous; when they have no perceptible pulp 

 between the two surfaces*. 



CHAP. VI. 



OF COMPOUND LEAVES. 



A LEAF is said to be compound, when there are more than 

 one upon a common petiole or foot-stalk. 



Compound leaves are to be considered in respect to structure 

 and degree. 



I. By the Structure of a compound leaf is to be understood 

 the insertion of the folioles or lesser leaves, of which it is com- 

 pounded ; and in this respect leaves are called, 



1. Compound; when a single petiole furnishes more than one 

 leaf. 



2. Articulate, jointed ; when one leaf grows out at the top 

 of another. 



3. Digitate, fingered ; when the apex of a single petiole con- 

 nects many folioles ; and they are termed Binate, Ternate, or 



* For the figures of these leaves, vide our Plates at the end of this work. 



