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Term Definition
Calyx tube In a gamosepalous calyx, the lower fused part; less commonly, in Ericaceae with inferior ovaries, the proximal portion of the calyx fused with the ovary wall which is the same as hypanthium in other flowering plants.
Corolla tube In a gamopetalous corolla, the lower fused part. Longitudinal section of a flower of Jacaranda copaia. Drawing by B. Angell.
Floral tube A tube formed by the fusion of sepals, petals, or both, or as an outgrowth of the hypanthium. Nectar often accumulates within the floral tube. Longitudinal section of a flower of Jacaranda copaia. Drawing by B. Angell.
Receptacular tube In the Cactaceae, the broadened part of the receptacle between the summit of the ovary and the point at which the receptacle begins to broaden. Same as epigynous hypanthium. Longitudinal section of a flower of Jacaranda copaia. Drawing by B. Angell.
Staminal tube A floral tube formed by the fusion of androecial tissue, usually the filaments. Staminal tube. Photo by C. A. Gracie.
Tube A chamber formed by the fusion of separate parts; e.g., the corolla tube or the tube of the spathe in Araceae. Staminal tube. Photo by C. A. Gracie.