Tiarella trifoliata

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Tiarella trifoliata
File:Tiarella trifoliata 21629.JPG
Tiarella trifoliata var. unifoliata
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Core eudicots
Order: Saxifragales
Family: Saxifragaceae
Genus: Tiarella
Species: T. trifoliata
Binomial name
Tiarella trifoliata
  • T. t. var. laciniata
  • T. t. var. trifoliata
  • T. t. var. unifoliata

Tiarella trifoliata, commonly called threeleaf foamflower,[1] laceflower,[2] or sugar-scoop,[2] is a dicot in the family Saxifragaceae.

It is native to the low to moderate elevation moist forests of western North America, from northern California to Montana and western Canada.


Tiarella trifoliata is a perennial herb that grows in the late spring.

The flowers are bell-shaped, white, solitary from an elongate, leafless panicle. The calyx lobes are 1.5–2.5 mm and petals are 3–4 mm. Basal leaves are 15–80 mm long and up to 120 mm wide, trifoliate or palmately 3- to 5-lobed. Cauline leaves are infrequent and much smaller.[1]


There are three varieties of T. trifoliata:

  • T. trifoliata var. trifoliata, which has leaves that are irregularly lobed, with coarse teeth.
  • T. trifoliata var. unifoliata, which has simple leaves.
  • T. trifoliata var. laciniata, which is confined in its range from Washington only as far north as Vancouver Island, and has deeply lobed leaves.[3]


  1. 1.0 1.1 "Tiarella trifoliata". WTU Herbarium Image Collection. Burke Museum, University of Washington. Retrieved 2013-04-18.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 "USDA GRIN Taxonomy".<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Pojar, Jim; MacKinnon, Andy. Plants of the Pacific Northwest Coast. Lone Pine Publishing, 1994, p. 168, ISBN 978-1-55105-040-9

External links