Leaf shape dichotomous key

This dichotomous key uses leaf form to separate four familiar trees. It starts with the broadest difference: pine needles versus broad leaves. Among broad leaves, pointed lobes identify maple and deeply rounded lobes identify oak. The remaining path identifies birch. A practical plant key should use features that persist across the season and can be viewed without specialist equipment. Leaf shape is a good starting point, although a fuller key may also use arrangement, bark, fruit, or buds. Check the wording against the plants in your local area before using it outdoors. It gives readers a concise reference they can reuse when discussing the result with colleagues.