Distribution: Both sides of the Cascades in Washington; introduced noxious weed, common in eastern United States, uncommon in the Pacific Northwest.
Habitat: Rich, moist soils in gardens, cultivated fields and waste areas.
Conservation Status: Not of concern
Robust annual, the erect, branched stems 0.5-2 m. tall, the herbage soft-hairy throughout.
Leaves alternate, petiolate, rotund and cordate, pointed at the apex, soft.
Flowers solitary in the leaf axils; sepals 5; petals 5, yellow, spreading, broadly obcordate and truncate, clawed, about 1 cm. long; stamens numerous, the filaments united in a tube; ovary superior, up to 3 cm. broad, the 9-15 carpels in a ring around a central axis.
Carpels somewhat flattened, with 3-9 ovoid, rough, gray seeds.