Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, forest edge, wastelots, and other disturbed areas at low elevation.
Origin: Introduced from Europe
Conservation Status: Not of concern
Usually glabrous annual or biennial, the stems stiffly erect, 2-6 dm. tall.
Leaves linear, opposite, 4-10 cm. long and 2-5 mm. wide, the cauline appressed, reduced above.
Flowers several in a congested inflorescence; calyx tubular, 5-lobed, 15 mm. long, 20-25 nerved, with 1-3 pairs of bracts at the base; petals 5, pink to red, 20-25 mm. long, clawed, the blades rhombic-obovate, toothed; stamens 10; styles 2.
Capsule 1-celled, opening by 4 valves, about equal to the calyx.