|jack pine (Pinus banksiana)||
jack pine (Pinus banksiana; PINE FAMILY [Pinaceae]) Potentially tall (70-80') evergreen tree, typically much smaller because of poor sites. Needles in bundles of 2, 1-1½" long, stiff and dark green. Bark scaly, dark gray to reddish brown. Cones 1-2" long, generally outcurved toward the tip of the branch, with each scale topped with a single short spine. Seeds on many individuals remain in cones until heating and drying produced by fire. Abundant on sandy soil throughout Wisconsin. Failure to "self-prune" gives this pine a ragged look. 
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