Distribution: Introduced occasionally in western Washington.
Habitat: Damp wasteland.
Flowers: July - September
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Bumblebees, bees, flies, wasps
Perennial, the stems 4-winged, erect, 4-10 dm. tall.
Leaves opposite, sessile, somewhat clasping, ovate-lanceolate to oblong-ovate, with translucent dots.
Inflorescence of leafy-bracteate cymes; sepals 5, pointed, not black-dotted; petals 5, pale yellow; flowers about 10 mm. wide; stamens numerous, styles 3.