Atalantia ceylanica, Rutaceae, is a wild citrus species from Sri Lanka and S India. Its flowers and leaves and scented and it produces small fruit which turn purple when ripe.

Its leaves are a larval food plant of several butterfly species, Blue Mormon (Papilio polymnestor parinda), Common Mormon (Papilio polytes romulus), Lime Blue (Chilades lajus lajus) and Lime Butterfly (Papilio demoleus demoleus); it is also a butterfly nectar source (van der Poorten & van der Poorten, 2016, The Butterfly Fauna of Sri Lanka).

Its leaves, bark and flowers are used in Ayurveda medicine.