01 / PINNATE
One central route
A prominent midrib with lateral veins branching from it. Many elm leaves offer useful examples. Trace the main route before the smaller branches.
Follow the veins. Reveal the pattern. Create your own botanical fingerprint.
Start investigating ↗A quiet place to look a little closer.
Illustrated study · not a species identification
Draw with a finger or mouse. Switch to Move image to pan; use the slider to zoom. Contrast enhances the image; it is not an X-ray.
Keyboard: focus the canvas; arrows move the cursor, Space starts/stops a stroke. U undoes a stroke.
Can a leaf be both pinnate and net-veined?
Look for one main midrib with side branches. Then look between those branches for a finer network. Are these two different ways of describing the same leaf?
Yes. Pinnate describes the arrangement of major veins. Reticulate describes a network of interconnected veins; the terms need not be mutually exclusive.
Learn the arrangement, then look for the connections. These are observation guides, not a plant identification key.
A prominent midrib with lateral veins branching from it. Many elm leaves offer useful examples. Trace the main route before the smaller branches.
Several major veins radiate from near the leaf base, as in many maples. Start at the base and follow each main route separately.
Major veins run largely alongside one another, as in many grasses. Look closely for small cross connections rather than assuming every vein is isolated.
Veins divide repeatedly into two branches. A ginkgo leaf is a useful example. Follow a fork outward and compare its next divisions.
Turn the paths you drew into a small piece of botanical art. The card records your strokes, not an automatically measured vein count.
Only traced paths and notes are saved. The original photo is not kept in your casebook.
Place a fallen leaf against a pale surface or photograph it with gentle light behind it. Keep the camera parallel to the blade. Strong reflections can hide fine veins.
First follow the primary veins, then the side branches, then finer connections. Use the three line styles to record your interpretation. Vein order depends on the specimen and is not inferred automatically.
Leaf shape, edges, arrangement, habitat, and other traits matter too. Record what you can see and leave uncertain connections untraced. A vein map alone cannot establish a species.
No. This is a manual observation and drawing tool. The built-in leaf is an original schematic illustration, not a measured photograph or a species specimen.
No. It changes display contrast and grayscale to help you see features already in the picture. It cannot reveal structures that were not captured.
The drawing tool processes your chosen photo in this browser. It has no photo-upload endpoint. Casebook entries are stored only in this browser when you press Save; other people using this browser may see them. Clearing site data removes them. Download a copy for long-term storage.
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To encourage close observation, careful drawing, and curiosity about everyday plants. Illustrations and interactive tools were created for this project. Educational terminology is checked against university botany references below. Last reviewed: 26 October 2026.
University of Illinois · Leaf venation
Texas A&M · Vegetative characters