ArticleBiodiversity data journal2026
An enumeration of Philippine vascular plants in Samar Island Natural Park: floristic evidence for outstanding universal value.
Article in Biodiversity data journal, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Samar Island Natural Park (SINP), the largest terrestrial protected area in the Philippines, encompasses the nations's most extensive karst landscape and largest remaining intact old-growth forests. While it is widely recognised for its exceptional biodiversity, comprehensive information for SINP, especially for plants, remains elusive. As a result, major taxonomic and distributional gaps persist. Nevertheless, with its immense biological value and urgent conservation needs, SINP has been nominated as a UNESCO World Heritage Site. To bolster this nomination, field surveys combined with secondary data were performed to generate a checklist of vascular flora of SINP. New information: A total of 874 morphospecies representing 124 families and 444 genera were documented in SINP. The flora is predominantly native and exhibits high endemism, including 339 Philippine endemics and 37 species restricted to Samar Island, alongside 82 newly-recorded species for the island. The taxonomic composition, dominated by Rubiaceae, Orchidaceae and other species-rich families, reflects both regional floristic patterns and SINP's biogeographical positioning within the Sunda-Sahul Convergence Zone. Moreover, a notable portion of its flora is threatened under the IUCN and DENR-DAO listings, with the majority classified as Not Evaluated. Collectively, these findings demonstrate that SINP functions as a critical refuge for some of the Philippines' most unique and vulnerable plant lineages.
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