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In page Hypanthium:

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In angiosperms, a hypanthium or floral cup[1][2][3] is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube and calyx tube.[citation needed] It often contains the nectaries of the plant. It is present in many plant families, although varies in structural dimensions and appearance.[4] This differentiation between the hypanthium in particular species is useful for identification. Some geometric forms are obconic shapes as in toyon, whereas some are saucer-shaped as in Mitella caulescens.