The Outer Baduy are a Sundanese indigenous people living in the interior of Lebak Regency, Banten Province. They are known for their lifestyle, which upholds traditions, local knowledge, and harmony with nature. The purpose of this study was to determine the local knowledge of the Outer Baduy in the use of plant species as medicine. This type of research uses a quantitative and qualitative research approach (combined method) that is descriptive exploratory using survey methods and semi-structured interviews and open interviews (unstructured interviews) with the PEA (Participatory Ethnobotanical Appraisal) approach. Sampling was carried out using purposive sampling and snowball sampling techniques. The sample consisted of key informants and non-key informants. The results of the study showed that the Outer Baduy Tribe uses 89 types of plants as medicine belonging to 47 families. The types of medicinal plants with the highest percentage of use are Ginger (Zingiber officinale) at 2.74%, Kandiri Leaf (Bridelia monoica L.) and Green Coconut (Cocos nucifera) at 2.46%. Plant organs used as medicine consist of leaves at 48.35%, stems at 18.96%, rhizomes at 12.6%, fruits at 6.87%, roots at 3.82%, fruit skin at 3.56%, bark at 2.93%, flowers at 1.53%, midrib at 1.02% and sap at 0.38%. The methods of utilizing plants as medicine are by boiling 44.2%, kneading 18.2%, pounding/crushing 12%, eating/drinking directly 11.2%, grinding 5.4%, grating 5.1% and squeezing 3.8%. The methods of obtaining medicinal plants by the Outer Baduy Tribe include searching in the wild with the highest percentage value of 69.1% and by cultivating or planting them themselves at 30.9%.
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