Dichotomous Key
Divide into two
Divide into two
Broad
leaves
Leaves
opposite
Leaves
alternate
Leaves
Whorled
(Catalpa)
Needle-type leaves
(evergreen trees)
Leaves single
(Spruce)
Leaves in bundles
(Pines)
Leaves
compound
Leaves
simple
Leaves lobed
(Maple)
Leaves unlobed
(Jap Tree lilac)
Pinnately
compound
Palmately
compound
(Horsechestnut)
Fine or
no teeth
(Ash)
Large teeth
or lobed
(Boxelder)
Simple
Compound
20-30 leaflets
1-2” long
(Honeylocust)
15-23 leaflets
3-6” long
(Black Walnut
13-25 leaflets
6-12” long
(Tree of Heaven)
Leaves
lobed
Leaves
unlobed
Pinnately
Lobed
(Oaks)
Palmately
Lobed
(Sycamore)
Large
Teeth
Fine
Teeth