How it works
This leaf diagram labeled part by part shows a simple leaf growing from a stem and a compound leaf beside it. The simple set of 7 main parts suits younger classes; all 11 add the stipules, apex, base and bud.
Read the full guide
Simple and compound leaves
A simple leaf has one blade. A compound leaf's blade is divided into leaflets on a central rachis, and the whole compound leaf still has one petiole. A bud sits in the axil where a whole leaf meets the stem, and leaflets have none: that tells a compound leaf from a twig of small leaves.
Blank leaf to print
Print blank gives both leaves with numbered rings and empty lines for the names; Print labelled is the key. Colour the blade and leaflets before labelling, and leave the veins a darker line.
- Petiole and stipule both start at the stem. The petiole is the one stalk; stipules are the two small flaps either side of it.
Questions and answers
What are the main parts of a leaf?
The blade, or lamina, is the broad flat part; its edge is the margin. The midrib runs down the middle with veins branching off it, and the petiole joins the leaf to the stem.
What is the difference between a midrib and a vein?
The midrib is the main vein, running the length of the leaf. The veins branch from it to each side, forming a net in most broad leaves, while grass and other monocots have veins running side by side.
Do all leaves have a petiole?
No. A leaf with no petiole joins the stem directly and is called sessile. Stipules are also missing on many plants, so a real leaf may show fewer parts than this diagram.