Japan Flora: Slightly pubescent annual; stems 30-40 cm. long, the branches obliquely spreading; leaves broadly ovate, 3-7 cm. long, 2-5 cm. wide, short-acute, rounded at base, nearly entire or with few obscure teeth, petiolate; flowers solitary in axils, pale yellow, the pedicels about 1 cm. long, pubescent; calyx 4-5 nun. long at anthesis, ovoid, about 2.5 cm. long in fruit, short- pubescent especially on the angles, green; corolla about 8 mm. long; fruit globose, about 1 cm. across. Aug.-Oct.
A tropical American plant cultivated in our area and often naturalized.