Pinnately compound leaf . Palmately compound leaf . Palmate venation . Abscission zone . Longitudinal section of Acer stem x40 with leaf petiole coming off to the left.
Arrow shows the abscission zone.
A vein enters the leaf passing through the abscission zone. Asclepias leaf abscission x40. The pointer shows the abscission zone in this stem ls. The petiole is on the left with a vein passing through the abscission zone. A group of flower buds is on the right.