There is no exact number. The reason behind this is each year there is always new hybrid trees being grown.
Heirloom varieties of vegetables are varieties that were grown in the past which have not been grown for some time.
No, sweet corn varieties were first grown by Native Americans. Now a days most of these varieties have been lost and hybrid varieties are the most common. You can still find older varieties at places like Seed Savers and Johnny's Selected Seeds. Country Gentleman and Stowell's Evergreen are two of the more common, though others are available, particularly from "heirloom" seed houses.GMO, or genetically-modified organism, corn is not available to the home gardener due to the proprietary legal requirements attached to the use of the seed.
Apples
There are a wide variety of crops grown in Kentucky. These include corn, grains, soybeans, tobacco, as well as hay.
Several varieties of Bryophyllum are grown from buds produced at the leaf margins.
pine, oak, rhododendron, poplar, walnut, and larch
yes there are different varieties of kale. kale is a form of cabbage and one of the oldest varieties that was first grown in Mediterranean and was popular for centuries throughout Europe.
tobacco
more then 90% of all vegtables
99 percent of US corn is grown from hybrid seed, but not sure about world crops.
Corn is grown in all parts of the state.
Poplar trees have around 30 species, the most popular English names are Cottonwood, Aspen, Poplar, for more information: Please see related link below.