Trillium ovatum
western trillium, white trillium
Petals change to pink or purple as they age.

Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California.

Habitat: Open to dense moist forests at low to mid-elevations, often where boggy in the spring.

Flowers: March-June

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Glabrous perennial herbs from short, thick rhizomes, the flowering stem 1-3 dm. tall.


Leaves usually 3, whorled, at the top of an otherwise naked stem; leaves not mottled, sub-sessile, broadly ovate to deltoid-obovate, 5-15 cm. long and broad, pointed.


Flowers solitary, stalked, the peduncle 2-8 cm. long; sepals 3, green, narrowly oblong, 1.5-6 cm. long; petals 3, white, longer than the sepals and much wider; stamens 6, filaments 3-6 mm. long, anthers 6-14 mm. long, cream colored.


Fruit a fleshy capsule, yellowish, slightly winged.

Identification Notes:

T. ovatum is distinguished from our other Trilliums by its stalked flowers and sessile unmottled leaves. The leaves form a single whorl of 3 below the solitary flower.

Accepted Name:
Trillium ovatum Pursh
Publication: Fl. Amer. Sept. 1: 245. 1814.

Synonyms & Misapplications:
Trillium ovatum Pursh var. ovatum [FNA26, HC2]
Trillium scouleri Rydb. ex Gleason
Additional Resources:

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

WA Flora Checklist: Trillium ovatum checklist entry

OregonFlora: Trillium ovatum information

E-Flora BC: Trillium ovatum atlas page

CalPhotos: Trillium ovatum photos

111 photographs:
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