Expression of an ideal botanical term and its concept should be clear and precise. Ambiguous statements in plant terminology would become barriers to botanical progress and teaching. The structures of flowers are very complex and diverse, and there are many doubtful terms and concepts about the structures in botany textbooks. Herein, many issues on flower structures are discussed, including the origin, diversity and Chinese name of the hypanthium, the concept hierarchy of the perianth, the evolution of flower structure lobes, the name confusion of some corolla types, the spatial position relationship between stamens and corolla, the difference between petaloid stamens and petaloid staminodes, the conceptive relationship between posi-tion of ovary and flower, and the origin and growth of gynophore. Among these problems, our description on gynophore mostly comes from speculation and needs to be verified by experiments.