Open Access Research Paper Views (425) Download (29) Richness, endemism and conservation status of woody plants in the lowland forest over limestone of Northern Sierra Madre Natural Park, Northeast Luzon, Philippines MA. Visitacion, D. Guingab J. Bio. Env. Sci.14( 5), 135-141, May 2019. Key: Limestone forestNSMNPPhilippine endemicsSpecies richnessThreathened species Details