MORPHOLOGY OF HIGHER PLANTS. 



355 



that of an acute angle; OBTUSE, when the angle is blunt; ACUMI- 

 NATE, when the angle is prolonged ; TRUNCATE, when the end of 



FIG. 203. Variation in the form of leaves on the same plant: A, B, C, Leaves or 

 sassafras; ,D, young castor oil plant showing cotyledons (t) and variously lobed older 

 leaves. 1, lamina; p, petiole. 



the leaf appears to be cut off ; RETUSE, when it is slightly notched 

 at the apex ; OBCORDATE, when the notch is pronounced ; EMAR- 

 GINATE, when the degree of notching is between retuse and 



