Foamflower, Foam Flower: Tiarella trifoliata var. laciniata - Not in the Columbia River Gorge. Basal and stem leaves have 3 leaflets. Each leaflet is cleft more than 1/2 the way into the middle. Flowers white, tiny, in a loose panicle.
Trefoil False Mitrewort, Trefoil Foamflower: Tiarella trifoliata var. trifoliata - Basal and stem leaves have 3 leaflets. Each leaflet is cleft less than 1/2 the way into the middle. Flowers white, tiny, in a loose panicle.
Coolwort, Foamflower, Foam Flower, One-leaf Foamflower: Tiarella trifoliata var. unifoliata (Synonyms: Tiarella trifoliata ssp. unifoliata, Tiarella unifoliata) - Basal and stem leaves simple, maple-leaf shaped with several lobes. Flowers white, tiny, in a loose panicle.