Spiraea cantoniensis

Spiraea cantoniensis is a species of flowering plant in the rose family, Rosaceae. It is sometimes referred to by the common names Reeve's spiraea, bridalwreath spirea, double white may, Cape may or may bush. It is an ornamental plant featured in gardens, it is a shrub growing up to 1.5 metres (4.9 ft) tall with frothy, pompom-like clusters of snow-white flowers borne along arching branches that bloom in May in its native country, hence its common name....read more on Wikipedia.