Summary ⁴

Trillium ovatum, the Western Wake Robin, Pacific Trillium, 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...

Description ⁵

Rhizomes semierect to horizontal, short, stout, praemorse. Scapes 1–2, round, 2–5 dm, ± slender, glabrous. Bracts sessile, subsessile, or short-petiolate; blade medium green, sometimes blotched and mottled, main veins prominent, ovate-rhombic, 7–12 × 5–20 cm, continuing to expand during anthesis, base rounded, apex acuminate. Flower erect or nodding, odorless; sepals spreading to horizontal, green, lanceolate to oblong-lanceolate, 15–50 × 6–20 mm, margins entire, apex acute; petals erect-ascending, usually wide-spreading from base, exposing entire pistil, white or with pink or blush markings, lacking V-shaped markings, fading to rosy pink, purple, or dark red, veins not deeply engraved, ± linear to widely obovate, 1.5–7 ×1–4 cm, widest at or above middle, thin-textured, margins flat to undulate, apex acuminate; stamens prominent, slightly recurved-spreading to straight, 10–18 mm; filaments white, shorter than anthers, slender; anthers yellow, 4–16 mm, slender, dehiscence latrorse-introrse; ovary green or white, ovoid, 6-angled, 5–12 mm, attachment ± 3/4 ovary width; stigmas recurved, barely connate basally, greenish white or white, linear, not lobed adaxially, 6–10 mm, uniformly thin; pedicel erect to leaning, 2–6 cm. Fruits baccate, green or white, ± odorless, broadly ovoid, obscurely winged, 1.2–2.8 × 0.7–1.9 cm, pulpy-moist. 2n = 10.

Distribution ⁶

Trillium ovatum is distributed somewhat broadly over the northwest USA and southeastern Canada. Canadian provinces of occurence are Alberta and British Columbia. USA states of occurrence are Washington, Oregon, California, Idaho, Montana, Wyoming and Colorado

National nature serve conservation status ⁷

Canada

United States

Sources and Credits

1. (c) Brent Miller, some rights reserved (CC BY-NC-ND), http://www.flickr.com/photos/88016824@N00/462421830
2. (c) Thayne Tuason, some rights reserved (CC BY-NC), http://www.flickr.com/photos/thaynet/8725780477/
3. (c) Thayne Tuason, some rights reserved (CC BY-NC), http://www.flickr.com/photos/thaynet/8725777689/
4. Adapted by dlimandri from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Trillium_ovatum
5. (c) Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA, some rights reserved (CC BY-NC-SA), http://eol.org/data_objects/5019592
6. (c) Unknown, some rights reserved (CC BY-NC), http://eol.org/data_objects/7125298
7. (c) NatureServe, some rights reserved (CC BY-NC), http://eol.org/data_objects/26647329

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Calflora
• CalPhotos
• eFloras.org
• Flora of North America (beta)
• Global Biodiversity Information Facility (GBIF)
• HOSTS - a Database of the World's Lepidopteran Hostplants
• IPNI (with links to POWO, WFO, and BHL)
• Jepson eFlora
• NatureServe Explorer 2.0
• OregonFlora.org
• SEINet Symbiota portals
• Tropicos
• USDA PLANTS database
• VASCAN by Canadensys
• World Flora Online

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