Trillium ovatum, the Pacific trillium or western white trillium, is a member of the Trilliaceae family. It occurs in parts of the western United States and western Canada, usually in rich forest. In the northern part of its range, which includes southern British Columbia, extreme southwestern Alberta, Washington, Oregon and east to Montana, Wyoming and Northern Colorado. It often grows under Douglas-fir or other trees which frequently shade this plant including grand fir, western red cedar, and western hemlock. Trillium ovatum is a perennial herb spreading by means of underground rhizomes. Each plant has 1 or 2 flowering stalks, each up to 50 cm tall. Flowers are white or pink, the color sometimes becoming darker as they get older. Occasionally, the petals are maroon rather than the typical white or pink.