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bur oak
Quercus macrocarpa
1,899 observations
eastern black walnut
Juglans nigra
1,744 observations
white oak
Quercus alba
1,351 observations
shagbark hickory
Carya ovata
1,237 observations
American hazelnut
Corylus americana
1,028 observations
American hophornbeam
Ostrya virginiana
877 observations
northern red oak
Quercus rubra
729 observations
shingle oak
Quercus imbricaria
574 observations
swamp white oak
Quercus bicolor
540 observations
bitternut hickory
Carya cordiformis
534 observations
chinkapin oak
Quercus muehlenbergii
526 observations
American hornbeam
Carpinus caroliniana
522 observations
American beech
Fagus grandifolia
448 observations
black oak
Quercus velutina
426 observations
blackjack oak
Quercus marilandica
311 observations
pin oak
Quercus palustris
284 observations
river birch
Betula nigra
252 observations
common alder
Alnus glutinosa
238 observations
post oak
Quercus stellata
219 observations
Butternut
Juglans cinerea
140 observations
northern pin oak
Quercus ellipsoidalis
132 observations
cherrybark oak
Quercus pagoda
125 observations
Shellbark Hickory
Carya laciniosa
89 observations
mockernut
Carya tomentosa
85 observations
swamp chestnut oak
Quercus michauxii
74 observations
overcup oak
Quercus lyrata
72 observations
sweetfern
Comptonia peregrina
72 observations
swamp birch
Betula pumila
71 observations
paper birch
Betula papyrifera
67 observations
southern red oak
Quercus falcata
67 observations
pignut hickory
Carya glabra
65 observations
pecan
Carya illinoinensis
61 observations
willow oak
Quercus phellos
55 observations
smooth alder
Alnus serrulata
54 observations
Shumard oak
Quercus shumardii
52 observations
Black Hickory
Carya texana
52 observations
chestnut oak
Quercus montana
35 observations
scarlet oak
Quercus coccinea
32 observations
Sawtooth oak
Quercus acutissima
32 observations
Chinese chestnut
Castanea mollissima
28 observations
grey alder
Alnus incana
17 observations
water hickory
Carya aquatica
17 observations
American chestnut
Castanea dentata
13 observations
European beech
Fagus sylvatica
12 observations
silver birch
Betula pendula
9 observations
red hickory
Carya ovalis
9 observations
yellow birch
Betula alleghaniensis
7 observations
English oak
Quercus robur
7 observations
gray birch
Betula populifolia
5 observations
Lea oak
Quercus × leana
4 observations
Frequently Asked Questions
- The 10 most common deciduous trees in Illinois are:
- bur oak (Quercus macrocarpa)
- eastern black walnut (Juglans nigra)
- white oak (Quercus alba)
- shagbark hickory (Carya ovata)
- American hazelnut (Corylus americana)
- American hophornbeam (Ostrya virginiana)
- northern red oak (Quercus rubra)
- shingle oak (Quercus imbricaria)
- swamp white oak (Quercus bicolor)
- bitternut hickory (Carya cordiformis)
- The most observed deciduous tree in Illinois is bur oak (Quercus macrocarpa), with 1,899 recorded observations.