The Olentangy Wetlands is a 52 acre wetland site that is owned by OSU and is a long term research site that is located near the Olentangy River and bike path.  The wetland construction began in 1993 and concluded in 1994.  Today, water from the Olentangy River is pumped into one of the wetlands to maintain the wetland habitat and the amount of water that is pumped is adjusted based on how much water is in The Olentangy River.  For the hardwood forest, water goes into and exits the wetlands through gravity.
While at Olentangy Wetlands, you can find several species of plants that have interesting facts about them.
The annual fleabane (Erigeron annuus) is a flower that’s in the daisy family and can also be found in the Olentangy Wetlands that is also a perennial flower.  The annual fleabane is a flower that can be used to help with various digestive ailments and can also be used as a diuretic.
The white ash (Fraxinus americana) is one of many plants that can be found in the wetlands.  The best way for me to identify it is by looking under the leaves and looking at how much more light the leaves are at the bottom vs at the top.  Unfortunately for all species of ash tree, including the white ash, the emerald ash borer have devastated the tree’s population and caused many ash trees to die.
Bottom of a white ash
The catalpa (catalpa spp.) is another tree that can also be found in the wetlands and there are multiple species of catalpa.  The most noticeable features of the catalpa is its curved trunk and it’s large, heart shaped leaves.  The catalpa is a tree that was brought in from the south and was brought to New England where it became naturalized and began to eventually spread.
The blackberry bush (Rubus occidentalis) is also found in the wetlands and is an important plant for many animals to eat.  Along with animals, many people also have a taste for blackberries and will also pick the berries when the berries are ripe.
The Black-eyed Susan (Rudbeckia hirta) is a widespread flower that can be found in the Olentangy Wetlands.  The flower has been used in traditional medicine in the past, with the roots being used to treat earaches.
The Amur honeysuckle (Lonicera maackii) is a plant that was introduced to the United States and has taken over many habitats and will release a chemical in the soil that kills surrounding plants.  Unfortunately, it is very difficult to kill the honeysuckle and it will often regrow when cut down.
The red berries on the Amur honeysuckle are unfortunately commonly eaten by birds, causing the plant to easily spread to new locations once they pass through the bird.  
Poison ivy (Toxicodendron radicans) is one plant that use to get me in trouble as a kid because I use to get it really bad and break out in a really bad rash and would need to get a steroid to get rid of the rash.  Today, I luckily don’t get too severe of a reaction to poison ivy.  I suspect that’s because I got it a lot when I was young.
Florence quality assessment index: 18.11
High CC
Species: Sycamore
CC Level: 7
Fact: The white pale bark that flakes was named for the look of a person being pale and sick.
Identifying feature: white bark
Species: Swamp white oak
CC Level: 7
Identifying feature: large, distinct leaves that are fan-shaped
Native Americans and Europeans commonly ate the acorns of the swamp white oak either raw or cooked and the acorns are considered to be an important food source for many animal species.
Species: Green ash
CC Level: 7
Fact: The wood of green ash is commonly used to make tool handles and baseball bats because of how hard the wood is and it’s ability to absorb shocks.
Identifying feature: Typically found in wetlands, has tight bark that is closely furrowed
Species: Water horsetail
CC Level: 7
Fact: The horsetail is a species that dates back to 350 million years ago.
Identifying feature: Looks like green straws coming out of the ground
Low CC
Species: Black raspberry
CC Level: 1
Fact: Native Americans commonly ate black raspberries throughout history and would preserve the berries by dehydrating them and eating the berries when it was winter and food was scarce
Identifying feature: Typically has three leaves with blueish stem
Species: Blackberry
CC Level: 1
Fact: The leaves and bark of blackberries have been traditionally eaten to treat sore throats and gum inflammation
Identifying feature: Typically has five leaves with brownish/red stem
Species: Virginia creeper
CC Level: 2
Fact: Virginia Creeper berries are toxic to people to eat and can cause death if eaten.
Identifying feature: five-leaved vine
Species: Riverbank grape
CC Level: 3
Fact: Has small fruits that are an important food source for many animals.  Fruits are sour until after a frost.
Identifying feature: Heart-shaped, with long pointy teeth around the leaf
Native CC
Species: Silver maple
CC Level: 3
Fact: The silver maple is a fast growing tree and is capable of growing 2 feet a year
Identifying feature: leaves are deeply 5-lobed and narrow terminal leaf bud.
Species: Eastern cottonwood
CC Level: 3
Fact: Commonly used to provide shade for outdoor locations because it grows so fast.
Identifying feature: Dark green, broadly triangular leaves
Species: Slippery elm
CC Level: 3
Fact: Named for it’s inner bark that is red, moist, and sticky.
Identifying feature: Pointy leaves that feel like sandpaper
Species: Summer grape
CC Level:4
Fact: The grape ripens in early fall and is an important plant for many species of animals as they migrate or get ready for hibernation.
Identifying feature: Red, wooly leaf undersides and twigs
Species: Sugar maple
CC Level: 4
Fact: Many animals are attracted to the sugar maple to eat the seeds, leaves, and buds.
Identifying feature: 5-lobed leaf with U-shape at top two lobes
Species: Obedient plant
CC Level: 5
Fact: Deer and rabbits won’t eat the obedient plant but pollinators are often attracted to the flower.
Identifying feature: Five parted light purple or white flowers with opposite, narrowly laced shaped leaves
Species: Black walnut
CC Level: 5
Fact: The black walnut is considered to be one of the most valuable trees because it’s wood is prized with furniture making and the nuts on the black walnut are known to be tasty to many people
Identifying feature: several leaflets on leaves and leaflets slightly toothed
Species: Paw-Paw
CC Level: 6
Fact: Popular for people to eat, the paw-paw has a fruit that tastes like a combination of a banana and a mango
Identifying feature: Long, large, and non-serrated leaves
High-lime loving plants
Species: Eastern redbud
CC Level: 3
Fact: The buds, seeds, and flowers of the Eastern redbud are all edible
Identifying feature: Heart shaped leaves that grows purple flowers
Species: Red Cedar
CC Level: 3
Fact: Fruit is commonly eaten by cedar waxwings and the twigs are often eaten by many species of browsing animals.
Identifying feature: 3-sided, needlelike, scaly leaves
Species: Water hemlock
CC Level: 3
Fact: The water hemlock is the most poisonous plant in North America and even a small amount of the plant can kill a person.
Identifying feature: Small white flowers, in wet areas, with alternate-compound leaves.
Species: Hackberry
CC Level: 4
Fact: The hackberry is a monoecious plant that produces flowers that are either male or female.  When the tree fruits, it is an  important source of food for many animals in the forest.
Identifying feature: Distinct looking bark with warty knobs
Invasive Plants
Species: White Mulberry
Fact: The white mulberry invades around forest edges and displaces the native trees.  The white mulberry is beginning to outcompete the native red mulberry by hybridization
Identifying feature: Distinct leaves that are somewhat shaped like a T.  Leaves hairless
Species: Catalpa
Fact: Europeans planted the catalpa to help grow wood to build dense posts, causing the tree to spread across North America
Species: Ground Ivy
Fact: Spreads across the ground and forms dense patches that push out native plants.
Identifying feature: small plant with round leaves
Species: Callery pear
Fact: Not considered to be an invasive tree yet but because of how the tree is continuing to spread as birds eat the fruits and spread the seeds, the gallery pear is beginning to takeover many understories.
Identifying feature: Thick, smooth leaves bundled together.