Below is the official tree list for the Ohio 4-H Forestry Competition 
The lists consists of 56 trees (11 conifers and 45 broadleaf species).
To download a PDF Version of the Tree List click here: Ohio Tree List 2015 Final-6-15
Below you will find that the common names are highlighted and serve as hyperlinks to the Virginia Tech Dendrology Fact sheets:
Gymnosperms (Conifers or Softwoods)
Common Name Scientific Name
eastern redcedar Juniperus virginiana L.
tamarack or eastern larch Larix laricina K. Kock.
blue spruce Picea pungens Engelm.
shortleaf pine Pinus echinata Mill.
red pine Pinus resinosa Ait.
pitch pine Pinus rigida Mill.
eastern white pine Pinus strobus L.
Virginia pine Pinus virginiana Mill.
baldcypress Taxodium distichum Rich.
northern white-cedar or arborvitae Thuja occidentalis L.
eastern hemlock Tsuga canadensis Carr.
Angiosperms (Broadleaf Trees or Hardwoods)
Common Name Scientific Name
boxelder Acer negundo L.
Norway maple Acer platanoides L.
red maple Acer rubrum L.
silver maple Acer saccharinum L.
sugar maple Acer saccharum Marsh.
Ohio buckeye Aesculus glabra
yellow buckeye Aesculus flava Ait. Willd.
tree-of-heaven Ailanthus altissima (Mill.) Swingle
sweet birch or black birch Betula lenta L.
river birch Betula nigra L.
bitternut hickory Carya cordiformis (Wangenh) K. Koch
pignut hickory Carya glabra Sweet
shagbark hickory Carya ovata K. Koch.
mockernut hickory Carya tomentosa Nutt.
hackberry Celtis occidentalis L.
flowering dogwood Cornus florida L.
persimmon Diospyros virginiana L.
American beech Fagus grandifolia Ehrh.
white ash Fraxinus americana L.
honeylocust Gleditsia triacanthos L.
American holly Ilex opaca Ait.
butternut or white walnut Juglans cinerea L.
black walnut Juglans nigra L.
sweetgum Liquidambar styraciflua L.
yellow-poplar Liriodendron tulipifera L.
cucumbertree or cucumber magnolia Magnolia acuminata L.
red mulberry Morus rubra L.
blackgum Nyssa sylvatica Marsh.
Royal paulownia Paulownia tomentosa (Thunb.) Steud.
American sycamore Platanus occidentalis L.
eastern cottonwood ` Populus deltoides Bartr.
black cherry Prunus serotina Ehrh.
white oak Quercus alba L.
scarlet oak Quercus coccinea Muenchh.
bur oak Quercus macrocarpa Michx.
northern red oak Quercus rubra L.
black oak Quercus velutina Lam.
chestnut oak Quercus prinus L.
pin oak Quercus palustris Muenchh.
black locust Robinia pseudoacacia L.
black willow Salix nigra Marsh.
sassafras Sassafras albidum Nees.
American basswood Tilia americana L.
American elm Ulmus americana L.
red elm or slippery elm Ulmus rubra Muhl.