2oo AN INTRODUCTION 
linear, flefhy, obtufe, convex underneath, 
and often witha cartilaginous Margin. 
Triquetrous, three-corned ; when they are 
fubulate, and have three flat longitudinal 
Sides. 
Sulcate, furrowed; when they are fcored 
longitudinally with numerous Angles or 
Ridges, and as many Hollows or Channels 
betwixt them. 
Carinate, keeled; when the prone Part of 
the Difk is prominent longitudinally. 
Membranaceous ; when they have no per- 
ceptible Pulp between the two Surfaces. 
CHAP. VI. 
Of CompPpounD Leaves. 
Leaf is faid to be Compound, when 
there are more than one upon a Pe- 
tiole or Footftalk, 
COMPOUND Leaves are to be confi- 
dered in refpe&t to Structure and Degree. 
By the STRUCTURE of a compound 
Leaf is to be underftood the Infertion of the 
Folioles, or leffer Leaves, of which it is 
compounded; and in this refpect Leaves are 
called, 
Compound ; 
