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bur oak
Quercus macrocarpa
1,819 observations
eastern black walnut
Juglans nigra
1,649 observations
white oak
Quercus alba
1,308 observations
shagbark hickory
Carya ovata
1,186 observations
American hazelnut
Corylus americana
988 observations
American hophornbeam
Ostrya virginiana
756 observations
northern red oak
Quercus rubra
711 observations
shingle oak
Quercus imbricaria
528 observations
bitternut hickory
Carya cordiformis
522 observations
chinkapin oak
Quercus muehlenbergii
510 observations
American hornbeam
Carpinus caroliniana
507 observations
swamp white oak
Quercus bicolor
505 observations
American beech
Fagus grandifolia
433 observations
black oak
Quercus velutina
412 observations
blackjack oak
Quercus marilandica
293 observations
pin oak
Quercus palustris
275 observations
river birch
Betula nigra
243 observations
common alder
Alnus glutinosa
231 observations
post oak
Quercus stellata
208 observations
Butternut
Juglans cinerea
131 observations
northern pin oak
Quercus ellipsoidalis
127 observations
cherrybark oak
Quercus pagoda
124 observations
mockernut
Carya tomentosa
85 observations
Shellbark Hickory
Carya laciniosa
79 observations
swamp chestnut oak
Quercus michauxii
73 observations
overcup oak
Quercus lyrata
71 observations
swamp birch
Betula pumila
69 observations
paper birch
Betula papyrifera
66 observations
pignut hickory
Carya glabra
66 observations
southern red oak
Quercus falcata
66 observations
sweetfern
Comptonia peregrina
62 observations
pecan
Carya illinoinensis
59 observations
smooth alder
Alnus serrulata
53 observations
willow oak
Quercus phellos
52 observations
Black Hickory
Carya texana
52 observations
Shumard oak
Quercus shumardii
49 observations
chestnut oak
Quercus montana
33 observations
scarlet oak
Quercus coccinea
31 observations
Sawtooth oak
Quercus acutissima
31 observations
Chinese chestnut
Castanea mollissima
27 observations
grey alder
Alnus incana
16 observations
water hickory
Carya aquatica
16 observations
American chestnut
Castanea dentata
12 observations
European beech
Fagus sylvatica
10 observations
silver birch
Betula pendula
9 observations
red hickory
Carya ovalis
9 observations
yellow birch
Betula alleghaniensis
8 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)
- chinkapin oak (Quercus muehlenbergii)
- The most observed deciduous tree in Illinois is bur oak (Quercus macrocarpa), with 1,819 recorded observations.