Palaquium ravii Sasidb. & Vink, formerly known from the districts of Trichur and Idukki has been collected from the Nelliampathy forests of Palakkad district. The species assumes to have a wider distribution than thought before, spanning from South of Palakkad (Palghat) clap up to Aryankavu pass. The genus Palaquium is a typical example for local vicariance and local endemism; while P. ellipticum (Dalz.) Baillon is distributed throughout the W. Ghats, P. bourdillonii Brandis is restricted to the Agasthyamalai ranges (Ashambu Hills) and P. ravii Sasidh. & Vink is restricted to the Anamalai-Palni-Cardamom hill complex.
Dr. V. S. Ramachandran and Swarupanandan, K., “Additional Notes on the Distribution of Palaquium ravii Sasidh. & Vink (Sapotaceae) and Local Vicariance and Endemism in Palaquium”, Journal of Economic and Taxonomic Botany , vol. 30, pp. 225-230, 2006.