THIRUVANANTHAPURAM: The Department of Botany, University of Kerala, and The Public Relations Society of India, Thiruvananthapuram Chapter, are hosting the release of `Flora of Kerala,' a planner trilogy inventorying the plant diversity of the State. The book, published by the Botanical Survey of India, will be released by university Vice-Chancellor M.K. Ramachandran Nair on Friday at the Senate Chamber. S.M. Sanjappa, director, Botanical Survey of India, will deliver the keynote address.