This teaching guide is one of a series developed by the Curriculum Research and Development Group at the University of Hawaii. The program is laboratory and field oriented for elementary students. The focus of study for the project is the plant and animal life and the physical components of the Hawaiian environment, and their ecological interrelationships. The program stresses student on-site observations, experimentation, discussion, and learning by experience. It is designed to fit within the science curriculum but can correlate with other subject areas in school, as well as with local community interests. This particular guidebook contains a sequence of observations and investigations about plant structures with vocabulary, procedures, and teacher background information specific to the given topics. The observations are concerned with stems, leaves, roots, flowers, fruits, vegetables, and seeds. There are numerous illustrations to help the teacher. This project series also includes a program namual that gives additional information about the philosophy and use of the Hawaii Nature Study Program. (Author/MA)