Kokoona zeylanica

Kokoona zeylanica, known in Sinhala as කොකුන් - (Kokun) is a species of plant in the family Celastraceae. The genus was formerly classified in the family Hippocrateaceae.
It is endemic to Sri Lanka. It is extant at Adam's Peak and at Kanneliya.
The species has been listed by the IUCN as threatened.
Description.
The "kokun" is a large tree with a rough grey bark. It flowers from March to May.
Uses.
The "kokun" is regarded as a medicinal plant traditionally used in a number of conditions. The seed oil from this plant is effective as a leech repellent.
The inner bark has been used by jewellers as a polish.