crown

noun

That part of a stem at or just below the surface of the ground, where roots join the stem; an inner appendage of a petal or the throat of a corolla; an appendage or extrusion standing between the corolla and stamens, or on the corolla; an outgrowth of the staminal part or circle as in milkweeds; in trees, the branches, twigs, and leaves that form the top of a tree; in roses, the region of the bud union, the point near soil level where the top variety and the understock are joined; a corona.