<![CDATA[Education in the 21st century requires teachers to demonstrate creativity by developing innovative learning resources, particularly in biology education. One form of printed teaching material that can be developed is a booklet, which offers visual appeal through illustrations, colors, and concise text. A booklet highlighting the local potential of the butter plant (Diospyros blancoi) is expected to serve as enrichment material for students, especially related to the Sub-Plantae concept. This study aims to (1) describe the population structure of Diospyros blancoi in the Sungai Landas Village area and (2) evaluate the feasibility of a booklet titled “Getting to Know Butter Plants in the Sungai Landas Village Area as Enrichment Material for High School Biology.†The booklet development followed the Plomp model, which includes five phases: preliminary investigation, design, realization/construction, testing, evaluation and revision, and implementation. The evaluation phase applied Tessmer’s formative evaluation approach. Population structure data were obtained by categorizing plants into three age phases: pre-reproductive, reproductive, and post-reproductive. The results showed that the number of pre-reproductive individuals was 6, reproductive 18, and post-reproductive 11. The density of each phase was 1.25 ind/ha (pre-reproductive), 3.75 ind/ha (reproductive), and 2.29 ind/ha (post-reproductive). The population exhibited a disturbed pyramid structure, indicating a potential decline in adult individuals in the future. The validity test yielded a score of 83.85% (valid), while the content practicality test scored 96.61% (very good) and the expected practicality test scored 97% (very good). Based on these results, the developed booklet is categorized as valid and practical, making it suitable for use as an enrichment material in high school biology learning.]]>
