Page author: David Giblin
Trillium petiolatum
purple trillium, purple wakerobin

Distribution: Occurring east of the Cascades crest in Washington; Washington to northeastern Oregon, east to Idaho.

Habitat: Stream banks, moist meadows, forest edge, and thickets at low to middle elevations in the mountains.

Flowers: April-June

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Glabrous perennial herbs from short, thick rhizomes, the annual stems largely subterranean, 5-18 cm. long.


Leaves 3, whorled, not mottled, long-petiolate; leaf blade nearly orbicular to broadly ovate, rounded or nearly cordate at the base, rounded at the tip, 8-13 cm. long and wide.


Flower solitary, sessile; sepals 3, green, narrowly oblong-elliptic, 2.5-6 cm. long; petals 3, usually reddish-purple, but sometimes yellowish, greenish or brownish, about the same size and shape as the sepals; stamens 6, filaments 1-3 mm. long, anthers 10-30 mm. long, purple.


Fruit a fleshy capsule.

Accepted Name:
Trillium petiolatum Pursh
Publication: Fl. Amer. Sept. 1: 244. 1814.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Trillium petiolatum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Trillium petiolatum checklist entry.

E-Flora BC: Trillium petiolatum atlas page.

CalPhotos: Trillium petiolatum photos.

USDA Plants: Trillium petiolatum information.

28 photographs:
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