Nerium divaricatum

About

Tabernaemontana divaricata, commonly called pinwheel flower, crape jasmine, Ceylon jasmine, East India rosebay, and Nero's crown, is an evergreen shrub or small tree native to South Asia, Southeast Asia and China. In zones where it is not hardy it is grown as a house/glasshouse plant for its attractive flowers and foliage. The stem exudes a milky latex when broken, whence comes the name milk flower.

Summary from Wikipedia