Tree Identification Basics

How to identify a tree

1Look at the leaves first — needle/scale (a conifer) or broadleaf (usually deciduous)?
2For broadleaf, check arrangement — opposite, alternate, or whorled on the twig.
3Simple or compound? — one undivided blade, or divided into leaflets (find the bud at the base of the whole leaf to be sure).
4Note leaf shape and margin — the outline (oval, lance, triangular, heart, lobed) and edge (smooth, toothed).
5Add bark, buds, fruit/cones, and form — especially to separate look-alikes and to ID a bare tree in winter.
6Use a field guide or dichotomous key — work the either/or questions with your region's guide.
7Confirm with habitat and range — a "match" that doesn't grow in your area probably isn't it.

ID before you use a plant or tree. Never eat nuts, berries, or plant parts, or use a wood for cooking skewers, without a confident, expert-confirmed ID — look-alikes can be toxic.
Some trees are hazards. Avoid burning poison-ivy-covered wood or certain toxic woods — learn your local hazardous plants.
Observe, don't damage. Look, photograph, and key it out without cutting or stripping bark.
Apps are aids, not authorities. ID apps make mistakes — for anything you'll eat or burn, confirm with an expert and a good field guide.

Leaves first, then bark. Leaves are the quickest ID; bark lets you tell similar trees apart and ID a bare tree in winter.
Find the bud to tell simple from compound. A single bud sits at the base of a whole leaf, not each leaflet.
Use several clues. No single feature is foolproof — combine leaf, bark, fruit, and habitat for a confident ID.

The ID framework is general botany — use a regional field guide, and don't publish a universal species list.