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Introduction: The Samar Island Natural Park (SINP) is a protected area because of high diversity of plant and animal species, some of which are endangered and endemic. To date, no plant assessment has been undertaken at SINP. This study seeks to investigate plant species’ richness and diversity at SINP, with emphasis on the anecdotal uses of medicinal plants. Methods: A total of 62 plants have been collected by random and their voucher specimens identified. The self-care uses of medicinal plants identified by the locals have also been documented. Results: The 62 plants collected were mostly represented by the families Rubiaceae, Zingiberaceae, and Asteraceae. These include 7 endemic and 2 endangered species. Diversity is highest in the montane forest of Mt. Pangi. Centella asiatica L. has given the highest informant consensus factor and fidelity level as it has been indicated for 5 disease categories, while Cassia alata L. has given the highest use values regardless of the diseases treated. The most common dosage form that has been used is decoction of either the leaves or roots. Conclusion: This study aims to assess the richness of species and diversity of medicinal plants in SINP, and document their ethnomedicinal uses.
Key words: Centella asiatica, Rubiaceae, Zingiberaceae, Cassia alata and Asteraceae