Vegetation of the state includes lodgepole pine, ponderosa pine; Douglas fir, larch, spruce; aspen, birch, red cedar, hemlock, ash, alder; rocky mountain maple and cottonwood trees. Forests cover approximately 25 percent of the state. Flowers native to Montana include asters, bitterroots, daisies, lupins, poppies, primroses, columbine, lilies, orchids, and dryads. Several species of sagebrush and cactus and many species of grasses are common. Many species of mushrooms and lichens are also found in the state.