Scientific name: Tabernaemontana divaricata or Tabernaemontana coronaria
Sanskrit name:  Nandeevriksha or Nandyavartha
English name:  East Indian Rose bay

Juice squeezed out of the flower bud of nanthyarvattom added with little amount of breast milk makes a good eye salve that can stop secretion of sticky pus in the eyes.

Buds kept in clean water overnight may be used as a good eye wash.

For more details on folk medicine:-
Annamma Devasia, Kayyunnapara, Valillappuzha P.O., Malappuram Dist. Ph:+91 9947578632