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Trillium ovatum
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Western Trillium
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Trillium ovatum

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About Western Trillium (Trillium ovatum) 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. Near California shores, it is common under coast redwood. Associated understory plants include swordfern, vanilla leaf, violets, redwood sorrel and salal.
Plant Description
Plant Type
Perennial herb

Max. Height
2.3 ft (0.7 m)

Flower Color

Flowering Season
Spring, Winter

Native Status

Natural Setting
Site Type
Moist slopes and canyon banks

Shade, Part Shade

Elevation ?
9' - 7623'

Annual Precip. ?
16.8" - 153.3"

Summer Precip. ?
0.24" - 5.63"

Coldest Month ?
33.6° F - 49.8° F

Hottest Month ?
51.2° F - 74.4° F

Humidity ?
0.01 vpd - 21.93 vpd

Sunset Zones ?
14, 15, 16, 17

Landscaping Information
Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Propagation ?
For propagating by seed: 1 mo. stratification.

Nursery Availability
Sometimes Available

Other Names
Common Names
Pacific Trillium

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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