Pergularia daemia, Apocynaceae, is a climber from Old World tropics, including Sri Lanka. Its parts contain toxic chemicals such as cardenolides.

In dry coastal areas of Sri Lanka, it is a major food plant (leaves only) of the Plain Tiger butterfly larva, Danaus chrysippus chrysippus (van der Poorten & van der Poorten, 2016, The Butterfly Fauna of Sri Lanka).

In Ayurveda, leaves and flowers are used for treating snakebite.