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Tiarella trifoliata var. unifoliata (Oneleaf foamflower)
Bransford, W.D. and Dolphia

Tiarella trifoliata var. unifoliata

Tiarella trifoliata L. var. unifoliata (Hook.) Kurtz

Oneleaf Foamflower, Western Foamflower, Sugar Scoop

Saxifragaceae (Saxifrage Family)

Synonym(s): Tiarella trifoliata ssp. unifoliata, Tiarella unifoliata


USDA Native Status: L48 (N), AK (N), CAN (N)

Western Foamflower is a colony-forming perennial that forms short rosettes of deep-green, rounded, toothed leaves. The leafy flowering stalk, usually 1-2 ft. high, carries horizontal to nodding, cup-shaped, usually white flowers followed by curious fruits which look like old-fashioned sugar scoops. Leaves remain evergreen through the year.


From the Image Gallery

7 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 2 feet tall.

Bloom Information

Bloom Color: White , Pink
Bloom Time: May , Jun , Jul , Aug , Sep
Bloom Notes: White to pinkish.


USA: AK , CA , ID , MT , OR , WA
Canada: BC
Native Distribution: CA Coast Ranges to s. AK, w. to s.w. Alt. & w. MT
Native Habitat: Shaded north slopes below 2000 ft.

Growing Conditions

Light Requirement: Shade
Soil Description: Cool, damp (in summer) soils.


Commercially Avail: yes

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Santa Barbara Botanic Garden - Santa Barbara, CA

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Tiarella trifoliata var. unifoliata in USDA Plants
FNA: Find Tiarella trifoliata var. unifoliata in the Flora of North America (if available)
Google: Search Google for Tiarella trifoliata var. unifoliata


Record Modified: 2023-02-28
Research By: TWC Staff

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