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Galinsoga quadriradiata
It is a species of flowering plant in the daisy family. This is an annual herb which varies in appearance. The main stem reaches anywhere from 10 - 60 cm in height and may branch or not. The petioled leaves are oval and serrated and are covered in a coat of soft hairs. The small flower heads are up to a centimeter wide and have rounded center filled with many disc florets usually in a shade of bright yellow
It is found throughout most of the temperate world, but apparently its native home is Mexico. In Portuguese-speaking countries where it is widely naturalized - e.g. in Brazil - it is known as botão-de-ouro.