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The Hawkeye State, 'Our liberties we prize and our rights we will maintain'
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Native Trees of Iowa
Recreation in Iowa often means heading
to one of the many lakes for swimming, fishing, hiking
or learning about the rich Native American area
history.  The landscape not only allows for the well
known farm lands responsible for feeding so many,
but has prairies, canyons, bluffs, and rolling hills,
which support an outdoor adventure for any skill level. 
As you wind your way through the many miles of
maple, hickory, and oak lined trails, you may stumble
across one of the numerous caves in Iowa.  For the
avid cave explorer, Maquoketa Caves State Park has
more caves than any other Iowa State Park.  Landbridges, streamside forests of ash and
basswood, nature centers, Native American burial mounds, a 'walk under' prairie, interpretive
trails- even one dedicated to 40 species of lichen- await visitors of Iowa's State Parks. 
  The many lakes of Iowa, in particular the 'lakes area' of northwest Iowa, offer year round
activities including swimming, boating, fishing and hiking on the miles of paved or rugged trails. 
Spirit Lake is actually the largest natural lake in Iowa.  With fish like bluegills, bullheads,
crappies, catfish, muskellunges, northern pike, perch, smallmouth bass, and white bass,
fishermen and families come from miles around to enjoy the peaceful environment or have
lunch.  Not only are there hickory and oak trees to picnic under here, it is estimated that 2 out
of every 100 trees in Iowa is a black walnut.  In fact, Iowa has the highest concentration of
black walnut trees anywhere in North America.  Because of this, black walnuts are the black
gold of Iowa as they are an integral part of the state's timber industry.  Also high in numbers
are Ash trees.  There are approximately 50 million ash trees within the state so it is no wonder
the threat poised by the Emerald Ash Borer is a concern for the overall forest and urban tree
health.  Trees attacked by the EAB will die within 2 years and any nearby ash trees should be
expected to die within 6 years as the non-native pest spreads. 
  Iowa also has the distinction of being the only state bordered by two navigable rivers.  This,
combined with the many lakes, allows for Iowa to have marshlands, flood plains, high bluffs,
rocky cliffs like those found in 'The Backbone', and 150 million year old exposed river beds. 
There are many parks set aside by the state for exploring the geological and natural wonders,
and horehounds in search of the state stone, the geode, will delight at the chance to find some
at Geode State park- just don't take anything out of the park!
   Autumn in Iowa ranks high on the beauty scale as the forests are mostly deciduous.  The
•  Iowa Native Trees A to Z
•  Iowa Tree Facts
•  Iowa Tree Families and Species
•  Endangered/Threatened Species
•  Tree Nurseries in Iowa
State Tree: Oak
The oak tree became the State Tree of Iowa in 1961 as a symbol of strength.  There are 12 species of oak trees native to Iowa including pin, swamp white, black, red, chinkapin, blackjack, post and bur.  Oak trees an important part of the ecosystem as a variety of wildlife feed on the acorns.  Oaks are also an important timber species.  
Oak trees typically grow 80 feet tall and may have a trunk diameter between 2 and 4 feet, though many trees grow wider or taller.  Often planted in parks for their attractive shape, foliage, and shade, oak trees are one of the top amenity trees.  They do best when given ample space to
grow and should be planted away from structures as their roots may disrupt foundations.   
   Common characteristics to all oak trees are lobed leaves and acorns.  The number of leaf
lobes can vary and red oak species will have leaves with a small prickle on the lobe tip. 
Acorns size, shape, and color is as diverse as the genus- some are round while others are
slender and some are black, brown, or any color in between.  Acorns can be barely nestled
inside their cap or almost completely engulfed by it like the Bur Oak. 
Bur Oak, Quercus macrocarpa, Bicentennial
Oak in Plano, Tx. Bob Woodruff Park.
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Iowa Native Tree Facts
Forested acres: 3 million
Percent of total area forested:
Largest Trees in Iowa: Eastern Cottonwood, Populus deltoides
Most Valuable Timber Tree: Black Walnut
Number of National Forests:
Number of State Parks/Forests/Recreational Areas:
Number of Tree city USA communities: 92
Number of invasive tree species: 26
(see state list for noxious/invasive plants)
Insects of Concern: Emerald Ash Borer, Gypsy Moth
Pathogens of Concern: Bur Oak Blight, Thousand Canker Disease
Number of tree families in our collection: 25
Number of endangered or threatened species in our collection:


US Forest Service
Iowa Association of Naturalists
United States Department Of Agriculture, Natural Resources Conservation Services: PLANTS Database

Additional state resources:
Iowa State Parks
Iowa Department of Natural Resources: Forest Health
Iowa State University, Forestry Extention
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Iowa Native Tree Families and Genera
click to enlarge.
Useful information while browsing species:

How to read a botanical name

• How to use our species boxes:
        -Color denotes a tree that is rare or endangered
Please note: This is not a complete list of all native tree families and species found in Iowa. We are constantly working towards a more comprehensive list and will add families and their species as completed. 
Additional Resources:

North American Native Tree Families
North American A to Z List by Scientific Name
North American A to Z List by Common Name
Follow the links to view species native to Iowa. If the genus is not linked, species are listed on the family page.

Aceraceae, Maple
Annonaceae, Custard-apple
    Betula, Birch   
    Carpinus, Hornbeam
    Corylus, Hazelnut
    Ostrya, Hophornbeam
Bignoniaceae, Trumpet Creeper
Cornaceae, Dogwood
    Cornus, Dogwood
    Nyssa, Tupelo
Cupressaceae- Cypress
    Juniperus, Juniper
    Thuja, Arborvitae
Ebenaceae, Ebony
    Diospyros, Persimmon
Fabaceae, Pea
Fagaceae, Beech
    Quercus, Oak
Hippocastanaceae, Horse-chestnut
Juglandaceae, Walnut
    Carya, Hickory
    Juglans, Walnut
Lauraceae, Laurel
Magnoliaceae, Magnolia
Moraceae, Mulberry
Oleaceae, Olive
    Fraxinus, Ash
Pinaceae, Pine
    Abies, Fir
    Pinus, Pine
Platanaceae, Plane-tree
    Platanus, Sycamore
Rosaceae, Rose
    Crataegus, Hawthorn
    Prunus, Plum/Cherry
Rubiaceae, Madder
Rutaceae, Rue
    Populus, Cottonwood
    Salix, Willow
Tiliaceae, Lindon
    Tilia, Basswood
    Celtis, Hackberry
    Ulmus, Elm
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Iowa Endangered or Threatened Tree Species
Additional Resources:

North American Rare and Endangered Trees

External Links:
Definition of status (per Iowa DNR website):

Special Concern- any species about which problems of status or distribution are suspected, but not documented. Not protected by the Iowa Threatened and Endangered Species law, but many animal species listed as Special Concern are protected under other state and federal laws addressing hunting, fishing, collecting, and harvesting.

Fraxinus quadrangulata- Blue Ash
Salix lucida- Shining Willow


Prunus nigra- Canada Plum
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Bur Oak, Quercus macrocarpa, acorns
2012 TreesForMe Original Image.   See usage requirements.
Threatened Species- any species which is likely to become an endangered species in the future throughout all or a significant portion of its range. Protected by law.

Endangered Species- any species of fish, plant life, or wildlife which is in danger of extinction throughout all or a significant part of its range. Protected by law.
Special Concern:

Abies balsamea- Balsam Fir
Acer spicatum- Mountain Maple
Amelanchier alnifolia- Saskatoon Serviceberry
Amelanchier sanguinea- Roundleaf Serviceberry
Asimina triloba- Pawpaw
Crataegus chrysocarpa- Fireberry Hawthorn
Crataegus chrysocarpa var. Chrysocarpa- Red Hawthorn
Crataegus disperma- Spreading Hawthorn, Two-fruited Hawthorn
Crataegus pruinosa- Waxyfruit Hawthorn
Prunus hortulana- Hortulan Plum
Sassafras albidum- Sassafras
Viburnum prunifolium- Blackhaw
summer green changes to red, orange, yellow and gold and gives bikers of the 50 mile Lake-to-Lake State Park Bike Route a more enjoyable experience.  Iowa is also one of the best places for equestrian trail riding.  Almost every park has equestrian friendly trails, some specifically for equestrian use only, and allow for scenic views of sweeping prairies, bluffs along the Mississippi river, or the quiet forest while ducking under sugar maple and basswood branches.  Eventually, anyone riding or hiking through Iowa's woodlands will marvel at the state's tallest trees, eastern cottonwoods.  During winter, cross-country skiing is a favorite past time in Iowa and the few conifers native to the state keep a touch of green year round.
Tree lists:
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A-Z by common
By Family
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A firmaret radicem amittere possit foliis in vento et triturabis bacchatur durante tempestas, sed supersit quia est flexibilis. Talis est vita.