Bitternut Hickory (Carya cordiformis) is the oilseed variety of hickory, not for eating but used for pressing oil which is renowned for it's delicious flavor and cooking qualities.
These 1-year bitternut hickory seedlings are between 3 and 8 inches tall, sold as bare-root seedlings.
Photo Credit: Ekem, CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons