Spruce beer is a beverage flavored with the buds, needles, or essence of spruce trees. These include jack pine, balsam fir, black spruce, white birch, and poplar. Coniferous trees such as black spruce, white spruce, and balsam fir dominate the native vegetation. Other timber used were ash, elm, pine, spruce and larch. The Northern Ural is dominated by Siberian species of fir, cedar, spruce and pine. The forest consists of pine, spruce, birch, and other species. Modern pine, spruce, and yellowwood trees all produce saccate pollen. The zone is made up mainly of beech, spruce, and fir forests. Effects on bird populations after fire in fir and spruce forests varied. Some mountain ash, hawthorn, spruce, and fir are also present. Patches of black spruce and larch stand in marshy valleys. The Sitka spruce zone is a lowland zone dominated by Sitka spruce and western hemlock. Other trees include the bur oak, the Black Hills spruce, and the cottonwood. The sound board is typically made of tone woods such as spruce or cedar. There are also occasional Engelmann spruce and blue spruce trees.