Distribution: Introduced as an ornmental and occasionally escaping throughout North America.
Habitat: Disturbed soil and wasteland.
Flowers: June - July
Conservation Status: Not of concern
Glabrous annual 1-7 dm. tall.
Leaves opposite, sessile and somewhat clasping, the lower oblanceolate, becoming lanceolate above, 2-5 cm. long and 0.5-1.5 cm. wide.
Flowers several to many in a flat-topped inflorescence; calyx narrowly tubular, 5-lobed, 13-17 mm. long, 10-nerved, glabrous; petals 5, pink, the claw 6-8 mm. long, the blade obovate, truncate, 4-7 mm. long; blade appendages 2, linear, 2-3 mm. long; stamens 10, styles 3.