[pnwflowers.com] Description, Habitat: Upright. Stems hollow, branched, hairless. Leaf petiole 4–20 in. circled with sheath at base. Leaves pinnately divided into 5–13 egg-shaped leaflets toothed or irregularly lobed, smaller on upper stem. Umbel rounded with clusters of yellow, white, or purple flowers with conspicuous calyx. Grows in wet meadows, bogs, along streams, often near conifer forests, at low to high elevations. Was recently discovered on the Queen Charlotte Islands on midcoast of British Columbia. (link added by Mary Ann Machi)