DIS61/ISHS OF LEAVES 



101 



tween the two. This articulation 

 suggests that the leaf may be the 

 remnant of a once compound leaf. 

 A closely related plant — the so- 

 called trifoliate orange — is shown 

 in Fig. 98, and here the 

 leaf is compound, with 

 the joint be- 

 low the three 

 leaflets. It is 

 generally con- 

 sidered that the 

 orange and the 



Pig. 99. 

 Leaves of the barberry. 



Fig. 100. 



Spinescent leaves of 

 the Russian thistle. 



lemon leaf is a unifoliolate (or one leaflet) com- 

 pound leaf. 



