Trillium albidum
giant trillium, sessile trillium

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

Habitat: Moist forests, oak-ash woodlands, thickets, and fields at low elevations.

Flowers: April-June

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)


Herbaceous perennial from short and thick rhizomes; stems erect, 20-60 cm tall.


Leaves 3, whorled, extending outwards past flower, sessile, 7-20 cm long and 12-15 cm wide, generally ovate, apex rounded to obtuse, green, sometimes with brown or purple tinged spots.


Flowers 1, sessile; sepals 3, free, persistent, green, spreading, 3-6.5 cm, lanceolate; petals 3, erect to ascending, free, withering, white to slightly pale pinkish, base sometimes purple; stamens 6, 15-25 mm, tissue between anther sacs greenish; ovary greenish to purplish, 3-chambered; styles 3.


Berry-like capsule, green to purplish green, pulpy and juicy; seeds, many, ovoid.

Accepted Name:
Trillium albidum J.D. Freeman
Publication: Brittonia. 27: 48, fig. 11. 1975.

Synonyms & Misapplications:
Trillium chloropetalum (Torr.) Howell, misapplied [FNA26, HC]
Trillium chloropetalum (Torr.) Howell var. chloropetalum, misapplied [FNA26]
Additional Resources:

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

WA Flora Checklist: Trillium albidum checklist entry.

OregonFlora: Trillium albidum information.

E-Flora BC: Trillium albidum atlas page.

CalPhotos: Trillium albidum photos.

USDA Plants: Trillium albidum information.

47 photographs:
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