Spiraea cantoniensis, the Reeve's spiraea, bridalwreath spirea, double white may, Cape may or may bush, is a species of plant native to China, belonging to the rose family Rosaceae. 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.