This is Magnolia acuminata, also known as cucumber tree. This tree is listed as an endangered species. Growing up to 65 feet tall this tree likes to live in sun to partial shade. From late Spring to the middle of Summer this tree has green and yellow blossoms. This tree attracts beetles. The wood from this tree makes for a very stunning polish, which is often used to make desk, crates, cabinets, boxes, and flooring. USDA Hardiness Zones 3 to 8.