Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California.
Habitat: Open, often rocky areas, mid- to high elevations in the mountains.
Flowers: May-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Butterflies, moths
Taprooted, tufted perennial, forming loose mats up to 1 dm. tall.
Leaves opposite, narrowly linear but rather soft, green and glabrous, up to 20 mm. long and 2 mm. wide.
Flowers solitary and sessile at the ends of the branches; calyx covered with loose, soft hairs, with flat, papery intervals between the herbaceous segments, the 5 lobes narrow and thickened; corolla white to light pink or blue, the tube 9-17 mm. long, nearly twice as long as the calyx, the 5 lobes 5-9 mm. long; filaments short and unequally attached in the corolla tube, style 3-parted, 5-8 mm. long; ovary superior.
Capsule 3 celled, with one seed in each cell.
PNW Herbaria: Specimen records of Phlox diffusa in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Phlox diffusa checklist entry
OregonFlora: Phlox diffusa information
E-Flora BC: Phlox diffusa atlas page
CalPhotos: Phlox diffusa photos