Leaf Bases: Auriculate
Click on the image for a larger view of the photo.
Click on the name for detailed information on the plant.

Auriculate Leaf Base

Ear-lobe shaped leaf base(s) attached to petiole.

The English Oak is an outstanding example of this characteristic and is used to easily distinguish it from other oaks such as a White Oak.

The leaf base on the Bigleaf Magnolia displays characteristics somewhere in between auriculate and subcordate.