Engelman Spruce (Picea engelmannii) Engelman Spruce is the only species of spruce native to the forests of our area. Its lumber is milk-white, light and strong. We grade-saw a small amount, as it has a small following for wood-workers. Since it has one of the highest weight to strength ratios of all wood species, spruce has been prized for everything from aircraft to guitars. Its lumber is pure white, usually straight grained and very light.