Which statement accurately describes marijuana?

The statement that marijuana refers to the plant Cannabis and its parts accurately encompasses the definition of marijuana. The term "marijuana" traditionally includes not only the flowers but also various other parts of the cannabis plant, such as leaves, stems, and seeds. This broader definition allows for a comprehensive understanding of marijuana in its many forms, including both raw plant material and processed products derived from different components of the plant.

By recognizing marijuana as belonging to the entire Cannabis plant family, one acknowledges the diversity of products that can be made from it and how various plant parts contribute to different uses. The other options focus on narrower definitions; for instance, stating marijuana is only flowers ignores the full potential of the cannabis plant. This comprehensive view is essential for understanding the plant's applications within both legal and medical contexts.