|Trillium ovatum var. ovatum in Mount Baker-Snoqualmie National Forest|
Trillium ovatum, the Pacific trillium, western trillium, western wakerobin, or western white trillium, is a member of the Trilliaceae family, or sometimes included within the Liliaceae or Melanthiaceae. 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. Other trees which frequently shade this trillium include grand fir, western red cedar, and western hemlock; bigleaf maple, red alder and Sitka spruce join in near the coast.
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.
- Trillium ovatum var. hibbersonii (T.M.C.Taylor & Szczaw.) G.W.Douglas & Pojar – Vancouver Island in British Columbia
- Trillium ovatum var. oettingeri (Munz & Thorne) Case – northwestern California
- Trillium ovatum var. ovatum – most of species range
- "Trillium ovatum". NatureServe Explorer. NatureServe. Retrieved 2008-05-02.
- Kew World Checklist of Selected Plant Families
- "Trillium ovatum". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 15 December 2015.
- Flora of North America, Trillium ovatum
- Case, Frederick W.; Case, Roberta B. (1997). Trilliums. Portland, Oregon: Timber Press. ISBN 0-88192-374-5.
- Douglas, George Wayne & Pojar, Jim. 2001. Canadian Field-Naturalist 115: 343
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