What is another word for calyx tube?
Pronunciation: [kˈalɪks tjˈuːb] (IPA) 
A calyx tube is the protective structure formed by the sepals of a flower fused together. Synonyms for this term include sepal tube, perianth tube, and hypanthium. The perianth tube describes the protective structure formed by both the sepals and petals of a flower fused together. The hypanthium refers to a cup-like structure that forms at the base of a flower, typically formed by the fusion of the calyx, corolla, and androecium. Other terms used to describe the calyx tube include floral tube, flower tube, and tube-like calyx. Each of these terms describes the same basic structure of a flower that provides protection to the reproductive organs of the plant.
