Epipetalous

Epipetalous (upon the petals), a term applied to the stamens in many gamopetalous flowers, such as primrose and lilac, when an intercalated receptacular outgrowth forms a common tube below both the true corolla-tube and limb and the anthers, so that the latter appear to spring in a more or less sessile manner from the corolla-tube. The same structure is termed Epiphyllous among petaloid monocotyledons, such as Narcissus, and other cases where the perianth is not readily distinguishable into calyx and corolla, as in Daphne.