Leaf Structure The Leaf Blade The blade is the entire leaf unit. Sometimes this is made up of several smaller leaflets.
Text of Leaf Identification to identify broad and narrow shaped leaves
Leaf Identification to identify broad and narrow shaped leaves to identify simple and compound leaf groupings to identify leaf arrangement to identify leaf margin characteristics to identify leaf venation to identify leaf structure Leaf Structure The Leaf Blade The blade is the entire leaf unit. Sometimes this is made up of several smaller leaflets. Leaf Veins Leaf Margin The margin is the term used to describe the edge of the leaf. Leaf Base Base is the name given to the part of the blade that is closest to the stem. Leaf Apex The Apex is the tip of the leaf. Petiole The Petiole is the thin stalk that connects the leaf blade to the stem Stipule Stipules are tiny leaf-like structures that may or may not be present at the base of the petiole. Petiolate and Sessile Leaves which have petioles are called Petiolate If a leaf has no petiole it is called Sessile. Seven Main Leaf Structures Leaf Blade The main part of a leaf is the blade. Nine major shapes Linear Lanceolate Oblong Elliptic Ovate Cordate Reniform Spatulate Orbicular Linear Narrow, with parallel or nearly parallel side Lanceolate lance shaped, longer than broad and tapering to a point at the tip Oblong Much longer than wide, with nearly parallel sides Elliptic Shaped like an ellipse, wider at the center and tapering to equal tips Ovulate egg-shaped, broader at the base than the tip Cordate Heart shaped, either the leaf shape or base Reniform Kidney shaped Spatulate In the shape of a spatula or spoon Orbicular Round Leaf Groupings How leaves are grouped on stem Simple Compound Three types of compound Leaf Margins The shape of the edge or margin of a leaf is another way it can be identified. Three kinds of margins are Entire, Toothed, and Lobed. Entire Smooth no bumps Toothed Shallow bumps Dentate Pointing outward Serrate Point to the leafs tip Crenate Broad and round Incised deeply cut with sharp, irregular teeth Lobed deep indents or sinuses Sinnate very wavy margin Undulate wavy margin, but not as wavy as a sinuate margin