UW Burke Herbarium species comparison

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Trillium albidum

Trillium ovatum

giant trillium, sessile trillium
Trillium ovatum

trillium, white trillium, western wake-robin
Habit Herbaceous perennial from short and thick rhizomes; stems erect, 20-60 cm tall. Glabrous perennial herbs from short, thick rhizomes, the flowering stem 1-3 dm. tall.
Leaves

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.

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

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.

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(s)

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

Fruit a fleshy capsule, yellowish, slightly winged.

Trillium albidum

Trillium ovatum
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.
Flowering time April-June March-June
Habitat Moist forests, oak-ash woodlands, thickets, and fields at low elevations. Open to dense moist forests at low to mid-elevations, often where boggy in the spring.
Distribution
Occurring west of the Cascades crest in Washington; Washington to California.
[WildflowerSearch map]
[BONAP county map]
Widely distributed on both sides of the Cascades crest in forested areas in Washington; British Columbia to California, east to Montana, Wyoming, and Colorado.
[WildflowerSearch map]
[BONAP county map]
Origin Native Native
Conservation status Sensitive in Washington (WANHP) Not of concern
Sibling taxa
T. ovatum, T. petiolatum
T. albidum, T. petiolatum
Subordinate taxa
T. albidum ssp. parviflorum
T. ovatum var. ovatum
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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