Tabernaemontana divaricata Linn.

Common Name: Pinwheelflower, crepe jasmine
Pinwheel Flower is an evergreen round shrub with large, glossy dark green leaves and waxy, white flowers. Its flower petals are twisted like pinwheels and are fragrant, especially at night. Small shrub with a broad surface, able to grow up to about 2 m tall. Dark green, glossy leaves are oval with a wavy leaf margin, measuring about 15 cm long and 5 cm wide. The white five-petaled pinwheel flowers bloom in small clusters on the stem tips. When broken, the stem exudes a milky latex that is toxic. However, in prescribed quantities, parts of the plant are used to treat a variety of ailments. The root is used to treat hypertension, headaches, scabies, and toothaches. The roots, leaves, and flowers are all used to treat snake and scorpion poisoning.

References
1. https://www.nparks.gov.sg/florafaunaweb/flora/2/4/2488
2. https://edis.ifas.ufl.edu/publication/FP568
3. http://www.flowersofindia.net/catalog/slides/Crape%20Jasmine.html
4. https://conservatoryofflowers.org/bloom/tabernaemontana-divaricata/