Burke: Trillium albidum vs. Trillium parviflorum

	Trillium albidum	Trillium parviflorum
	giant trillium, sessile trillium
Habit	Herbaceous perennial from short and thick rhizomes; stems erect, 20-60 cm tall.	Glabrous, scapose perennials from thick, brown rhizomes, the 1-3 terete scapes 1.7-3 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 sessile in a whorl of 3, the blade green with obscure mottling, ovate to broadly ovate, 6.5-16 cm. long and 5-8 cm. wide, not glossy, the tip obtuse.
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 and terminal on the scape; sepals 3, green, spreading, lanceolate, 16-25 mm. long and 4-8 mm. wide, entire; petals erect, concealing the stamens and ovary, white, linear to linear-lanceolate, 2.2 cm. long and 0.4-1 cm. wide, entire, the tip obtuse; stamens 6, erect, 10-15 mm. long, the filaments white or purplish-tinged; ovary superior, 3-celled; stigmas 3, erect, green, the outer surface purple.
Fruits	Berry-like capsule, green to purplish green, pulpy and juicy; seeds, many, ovoid.	Capsule sub-globose, maroon, 4-8 mm. long.

	Trillium albidum	Trillium parviflorum
Flowering time	April-June	March-May
Habitat	Moist forests, oak-ash woodlands, thickets, and fields at low elevations.	Moist forests, oak-ash woodlands, thickets, and fields at low elevations.
Distribution	Occurring west of the Cascades crest in Washington; Washington to California. [WildflowerSearch map] [BONAP county map]	Occurring west of the Cascades crest in Washington; lowland western Washington to Willamette Valley, Oregon. [WildflowerSearch map]
Origin	Native	Native
Conservation status	Sensitive in Washington (WANHP)	Sensitive in Washington (WANHP)
Sibling taxa	T. ovatum, T. petiolatum	T. albidum, T. ovatum, T. petiolatum
Subordinate taxa	T. albidum ssp. parviflorum
Web links	Local floras: 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	Local floras: 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 albidum

Trillium parviflorum

giant trillium, sessile trillium

Habit

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

Glabrous, scapose perennials from thick, brown rhizomes, the 1-3 terete scapes 1.7-3 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 sessile in a whorl of 3, the blade green with obscure mottling, ovate to broadly ovate, 6.5-16 cm. long and 5-8 cm. wide, not glossy, the tip obtuse.

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 and terminal on the scape;

sepals 3, green, spreading, lanceolate, 16-25 mm. long and 4-8 mm. wide, entire;

petals erect, concealing the stamens and ovary, white, linear to linear-lanceolate, 2.2 cm. long and 0.4-1 cm. wide, entire, the tip obtuse;

stamens 6, erect, 10-15 mm. long, the filaments white or purplish-tinged;

ovary superior, 3-celled;