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Use this simplified dichotomous key to identify trees. Start at step 1 and follow the choices until you reach a species group.
Costa Rica Tree Atlas
Palm - single unbranched trunk with crown of large leaves
→ Palms (Arecaceae)
Conifer - evergreen with needle-like or scale leaves, cones
→ Conifers
Broadleaf tree
→ Go to Step 2
Yes - deciduous (loses leaves in dry season)
→ Deciduous Trees
No - evergreen (keeps leaves year-round)
→ Go to Step 3
Compound leaves (multiple leaflets)
→ Go to Step 4
Simple leaves (single blade)
→ Go to Step 5
Pinnate (leaflets along a central stem) with pod fruits
→ Legumes (Fabaceae) - Nitrogen-fixing
Bipinnate (twice divided) or large pinnate leaves
→ Mahogany Family & relatives
Palmate compound (leaflets radiate from one point)
→ Trees with Palmate Leaves
Has milky latex when cut
→ Latex-producing Trees (Moraceae, Sapotaceae)
Showy tubular flowers, often opposite leaves
→ Trumpet Trees (Bignoniaceae)
Aromatic leaves when crushed
→ Aromatic Trees (Lauraceae, Myrtaceae)
Fleshy edible fruits
→ Fruit Trees