Taxonomy: Kingdom - Plantae (plants). Subkingdom - Tracheobionta (vascular plants). Superdivision - Spermatophyta (seed plants). Division - Magnoliophyta (Flowering plants). Class - Magnoliopsida. Order - Rosales. Family - Saxifragaceae (Saxifrage family). Genus -Tiarella L. Species - Tiarella trifoliata L.
Ecology: Shade-tolerant/intolerant, submontane to subalpine, Western North American forb distributed more in the Pacific than in the Cordilleran region. Occurs in hypermaritime to maritime climate on fresh to very moist, nitrogen-rich soils; occurrence decreases with increasing latitude, elevation, and continentality. Scattered to abundant on waterreceiving sites that support a very productive growth of Douglas-fir, Sitka spruce, true firs, and western redcedar. Often grow with Achlys triphylla, Athyrium filix-femina, Galium triflorum, Polystichum munitum, Rubus paroifIorus, and R. spectabilis. A nitrophytic species characteristic of Moder and Mull humus forms.