Burke: Tiarella trifoliata vs. Tiarella trifoliata var. laciniata

	Tiarella trifoliata	Tiarella trifoliata var. laciniata
	three-leaf foamflower	cut-leaved foamflower
Habit	Herbaceous perennial from slender rhizomes, the flowering stems 2-3.5 dm. tall, glandular-pubescent.
Leaves	Basal leaves with petioles 2-3 times as long as the blades; leaf blades highly variable, cordate, 1.5-8 cm. long and up to 12 cm broad, trifoliate and the leaflets deeply divided, or trifoliate and the leaflets shallowly lobed, or palmately 3- to 5 lobed; cauline leaves few and reduced.
Flowers	Inflorescence an elongate, leafless panicle; calyx bell-shaped, irregular, the 5 lobes longer than the tubular section, the upper lobe the largest; petals 5, white, linear, similar to the filaments; stamens 10, the filaments opposite the petals much shorter that the alternate 5.
Fruits	Ovary superior; carpels 2, unequal, 3-5 mm. and 7-10 mm. long respectively.

	Tiarella trifoliata	Tiarella trifoliata var. laciniata
Flowering time	May-August	May-August
Habitat	Moist woods and stream banks, sea level to mid-elevations in the mountains.	Forest understory at low elevations along the coast.
Distribution	Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Idaho and Montana. [WildflowerSearch map] [BONAP county map]	Occurring west of the Cascades crest in Washington; southwestern British Columbia to Lane County, Oregon. [BONAP county map]
Origin	Native	Native
Conservation status	Not of concern	Not of concern
Sibling taxa		T. trifoliata var. trifoliata, T. trifoliata var. unifoliata
Subordinate taxa	T. trifoliata var. laciniata, T. trifoliata var. trifoliata, T. trifoliata var. unifoliata
Web links	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	Local floras: BC, OR, WA 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

Tiarella trifoliata

Tiarella trifoliata var. laciniata

three-leaf foamflower

cut-leaved foamflower

Habit

Herbaceous perennial from slender rhizomes, the flowering stems 2-3.5 dm. tall, glandular-pubescent.

Leaves

Basal leaves with petioles 2-3 times as long as the blades;

leaf blades highly variable, cordate, 1.5-8 cm. long and up to 12 cm broad, trifoliate and the leaflets deeply divided, or trifoliate and the leaflets shallowly lobed, or palmately 3- to 5 lobed;

cauline leaves few and reduced.

Flowers

Inflorescence an elongate, leafless panicle;

calyx bell-shaped, irregular, the 5 lobes longer than the tubular section, the upper lobe the largest;

petals 5, white, linear, similar to the filaments;

stamens 10, the filaments opposite the petals much shorter that the alternate 5.

Fruits

Ovary superior;

carpels 2, unequal, 3-5 mm. and 7-10 mm. long respectively.