Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Dry, open, rocky places, from the lowlands to moderate or occasionally high elevations in the mountains.
Conservation Status: Not of concern
Perennial from a taproot that is often branched below the surface, the stems 1-4 dm. tall, often woody at the base, glabrous to glandular or hairy.
Leaves opposite, linear, 1.5-8 cm. long and 1-2.5 mm. wide, widely spaced along the stem.
Inflorescence a loose, few-flowered cluster, leafy-bracteate, fragrant, with slender pedicels; calyx with keeled, translucent intervals between the herbaceous segments, 5 lobed; corolla pink to white, the tube 10-18 mm. long, up to twice as long as the calyx, the 5 lobes 7-15 mm. long, obovate; filaments attached above the middle of the corolla tube; style elongate, 6-15 mm. long, 3-parted at the tip; ovary superior.
Capsule 3-celled, with one seed in each cell.
The long style separates P. longifolia from the similar P. speciosa, which has a very short style, not over 2 mm.