Distribution: Both side of the Cascades in Washington; Alaska south to California, east to Alberta and Idaho.
Habitat: Bogs and swamps, low to mid-elevations in the mountains.
Conservation Status: Not of concern
Perennial herbs from slender rootstocks and tubers, the tubers short and horizontal; flowering stems 5-20 cm. tall.
Main leaves 3-8 in a terminal whorl, elliptic to obovate, 1.5-5 cm. long, petiolate; cauline leaves few, smaller and reduced downward, sessile.
Flowers axillary from 1 or more leaf axils, on long, slender, curved pedicels; calyx parted to near the base, the 6 or 7 lobes linear-lanceolate; corolla usually white, 12-16 mm. broad, rotate, the lobes divided nearly to the base and the same number as the calyx, lance-ovate; stamens opposite the corolla lobes, exerted, the filaments glabrous, slender, considerably longer than the anthers.
Capsule opening by valves.
Trientalis europaea has a few stem leaves; Trientalis borealis has none.