Jack pines on a mountain summit.
jack pine definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a pine (Pinus banksiana) of Canada and N U.S., having short needles in pairs and many woody cones
jack pine definition by American Heritage Dictionary
An evergreen tree (Pinus banksiana) of northern North America, having soft wood and short twisted needles grouped in fascicles of two. Also called scrub pine.