Burke: Trillium catesbaei vs. Trillium ovatum

	Trillium catesbaei	Trillium ovatum
		trillium, white trillium, western wake-robin
Habit		Glabrous perennial herbs from short, thick rhizomes, the flowering stem 1-3 dm. tall.
Leaves		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 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		Fruit a fleshy capsule, yellowish, slightly winged.

	Trillium catesbaei	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		March-June
Habitat		Open to dense moist forests at low to mid-elevations, often where boggy in the spring.
Distribution	[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
Conservation status		Not of concern
Sibling taxa	T. albidum, T. ovatum, T. petiolatum	T. albidum, T. petiolatum
Subordinate taxa		T. ovatum var. ovatum
Web links	Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Trillium catesbaei

Trillium ovatum

trillium, white trillium, western wake-robin

Habit

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

Leaves

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 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

Fruit a fleshy capsule, yellowish, slightly winged.

Trillium catesbaei

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

March-June

Habitat

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

Distribution

[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

Conservation status

Not of concern

Sibling taxa

T. albidum, T. ovatum, T. petiolatum

T. albidum, T. petiolatum

Subordinate taxa

T. ovatum var. ovatum

Web links