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bur oak
Quercus macrocarpa
1,933 observations
eastern black walnut
Juglans nigra
1,784 observations
white oak
Quercus alba
1,369 observations
shagbark hickory
Carya ovata
1,249 observations
American hazelnut
Corylus americana
1,034 observations
American hophornbeam
Ostrya virginiana
899 observations
northern red oak
Quercus rubra
733 observations
shingle oak
Quercus imbricaria
602 observations
swamp white oak
Quercus bicolor
579 observations
bitternut hickory
Carya cordiformis
541 observations
chinkapin oak
Quercus muehlenbergii
534 observations
American hornbeam
Carpinus caroliniana
523 observations
American beech
Fagus grandifolia
452 observations
black oak
Quercus velutina
436 observations
blackjack oak
Quercus marilandica
315 observations
pin oak
Quercus palustris
297 observations
river birch
Betula nigra
270 observations
common alder
Alnus glutinosa
242 observations
post oak
Quercus stellata
225 observations
Butternut
Juglans cinerea
144 observations
northern pin oak
Quercus ellipsoidalis
137 observations
cherrybark oak
Quercus pagoda
124 observations
swamp birch
Betula pumila
100 observations
Shellbark Hickory
Carya laciniosa
90 observations
mockernut
Carya tomentosa
88 observations
overcup oak
Quercus lyrata
80 observations
swamp chestnut oak
Quercus michauxii
76 observations
sweetfern
Comptonia peregrina
72 observations
southern red oak
Quercus falcata
68 observations
paper birch
Betula papyrifera
67 observations
pignut hickory
Carya glabra
66 observations
pecan
Carya illinoinensis
64 observations
willow oak
Quercus phellos
56 observations
smooth alder
Alnus serrulata
54 observations
Black Hickory
Carya texana
53 observations
Shumard oak
Quercus shumardii
52 observations
chestnut oak
Quercus montana
36 observations
Sawtooth oak
Quercus acutissima
34 observations
scarlet oak
Quercus coccinea
31 observations
Chinese chestnut
Castanea mollissima
28 observations
grey alder
Alnus incana
18 observations
water hickory
Carya aquatica
17 observations
European beech
Fagus sylvatica
12 observations
American chestnut
Castanea dentata
10 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 1,933 recorded observations.