Editing Hypanthium (section)

{{Short description|Structure in angiosperms where basal portions form a cup-shaped tube}}
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|footer=In a pomegranate flower, ''[[Punica granatum]]'', the [[petal]]s, except for their fused bases, soon fall. The hypanthium with [[sepal]] lobes and [[stamen]]s still attached develops to form the outer layer of the fruit.}}
In [[angiosperms]], a '''hypanthium''' or '''floral cup'''{{sfn|Foster|2014|loc=[http://plant-phytography.blogspot.ca/2012/10/hypanthium-cup-shaped-or-tubular.html Hypanthium]}}<ref>{{cite book |author1=Beentje, H. |author2=Williamson, J. |year=2010  |title=The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms |publisher=Kew Publishing |location=Royal Botanic Gardens, Kew  }}</ref><ref>{{cite book |author1=Hickey, M. |author2=King, C. |year=2001  |title=The Cambridge Illustrated Glossary of Botanical Terms |publisher=Cambridge University Press   }}</ref> is a structure where basal portions of the [[Sepal|calyx]], the [[petal|corolla]], and the [[stamen]]s form a cup-shaped tube. It is sometimes called a '''floral tube''', a term that is also used for [[corolla tube]] and [[calyx tube]].<ref>"Lecture 7 – Pharmacognosy and Botany (1st Semester)" ''Azerbaijan Medical University'', n.d. Accessed May 9, 2025.</ref>
It often contains the [[nectar]]ies of the plant. It is present in many plant families, although varies in structural dimensions and appearance.{{sfn|Cronquist|1981}} This differentiation between the hypanthium in particular species is useful for [[plant identification|identification]]. Some [[geometry|geometric]] forms are [[obconic]] shapes, as in [[heteromeles|toyon]] (''Heteromeles''), whereas some are saucer-shaped, as in ''[[Mitella caulescens]]''.

Its presence is diagnostic of many [[family (biology)|families]], including the [[Rosaceae]], [[Grossulariaceae]], and [[Fabaceae]]. In some cases, it can be so deep, with such a narrow top, that the flower can appear to have an [[anatomical terms of location|inferior]] [[ovary (botany)|ovary]]{{snd}}the ovary is below the other attached floral parts. The hypanthium is known by different common names in differing species. In the [[eucalypt]]s, it is referred to as the ''gum nut''; in roses it is called the ''[[rose hip|hip]]''.