Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to Oregon, east to Montana, also in the Great Lakes region and eastern Canada.
Habitat: Streambanks and wet meadows at mid-elevations in the mountains
Flowers: May-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bumblebees, bees
Perennial from a stout rhizome and branched base, the numerous stems 2-15 dm. tall, glabrous or hairy.
Leaves thin, prominently veined, the basal ones, if present, long-petiolate and cordate; cauline leaves numerous, short-petiolate, the blade lanceolate to broadly ovate, pointed, 3-14 cm. long and 1.5-7 cm. wide, rounded at the base, gradually reduced upward.
Inflorescence branched and open; calyx 2-6 mm. long, cleft over half way to the base; corolla blue, 5-lobed, 9-16 mm. long, the limb 1.2 to 1.6 times as long as the tube; tube often with a ring of hairs below the middle within; filaments broad, shorter than the anthers; style longer than the corolla lobes; nutlets attached to the lower half of the style; hairy appendages opposite the corolla lobes at the top of the tube.
4 nutlets.
PNW Herbaria: Specimen records of Mertensia paniculata in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Mertensia paniculata checklist entry
OregonFlora: Mertensia paniculata information
E-Flora BC: Mertensia paniculata atlas page
CalPhotos: Mertensia paniculata photos