Cup-shaped extension of the floral axis (i.e. the receptacle), enlargement of the basal part of the flower, seemingly bearing calyx, corolla, stamens and surrounding the ovary, solid or tubular, believed to be formed out of the fused bases of the calyx, corolla and stamens; sometimes imprecisely called a floral tube.
Cup-shaped enlargement of the flower base surrounding the ovary and carrying the perianth above or part-way above the ovary.