Lamina, or leaf blade, is the flat part of the leaf.
Apex is the point or tip of the lamina.
Base is the bottom of the lamina.
Veins appear as raised lines on the lamina. See Leaf Venation in Primula
Mid rib is the prominent vein which runs from the apex through the center of the lamina.
Margin is the edge of the lamina.
Petiole is the leaf stalk which attaches the leaf to the plant stem.
Each of these parts can vary in shape as shown the diagrams.
|Leaf Apex, Venation & Bases|