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bur oak
Quercus macrocarpa
1,864 observations
eastern black walnut
Juglans nigra
1,684 observations
white oak
Quercus alba
1,327 observations
shagbark hickory
Carya ovata
1,221 observations
American hazelnut
Corylus americana
1,001 observations
American hophornbeam
Ostrya virginiana
759 observations
northern red oak
Quercus rubra
724 observations
shingle oak
Quercus imbricaria
541 observations
bitternut hickory
Carya cordiformis
524 observations
swamp white oak
Quercus bicolor
521 observations
chinkapin oak
Quercus muehlenbergii
519 observations
American hornbeam
Carpinus caroliniana
514 observations
American beech
Fagus grandifolia
441 observations
black oak
Quercus velutina
416 observations
blackjack oak
Quercus marilandica
303 observations
pin oak
Quercus palustris
281 observations
river birch
Betula nigra
248 observations
common alder
Alnus glutinosa
233 observations
post oak
Quercus stellata
216 observations
Butternut
Juglans cinerea
135 observations
northern pin oak
Quercus ellipsoidalis
130 observations
cherrybark oak
Quercus pagoda
124 observations
Shellbark Hickory
Carya laciniosa
89 observations
mockernut
Carya tomentosa
85 observations
swamp chestnut oak
Quercus michauxii
74 observations
overcup oak
Quercus lyrata
71 observations
swamp birch
Betula pumila
69 observations
paper birch
Betula papyrifera
67 observations
southern red oak
Quercus falcata
67 observations
sweetfern
Comptonia peregrina
66 observations
pignut hickory
Carya glabra
64 observations
pecan
Carya illinoinensis
60 observations
willow oak
Quercus phellos
55 observations
smooth alder
Alnus serrulata
53 observations
Black Hickory
Carya texana
52 observations
Shumard oak
Quercus shumardii
50 observations
chestnut oak
Quercus montana
35 observations
scarlet oak
Quercus coccinea
32 observations
Sawtooth oak
Quercus acutissima
31 observations
Chinese chestnut
Castanea mollissima
27 observations
water hickory
Carya aquatica
17 observations
grey alder
Alnus incana
16 observations
American chestnut
Castanea dentata
12 observations
European beech
Fagus sylvatica
11 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
4 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)
- bitternut hickory (Carya cordiformis)
- swamp white oak (Quercus bicolor)
- The most observed deciduous tree in Illinois is bur oak (Quercus macrocarpa), with 1,864 recorded observations.