Apetalous :: Apetalous (a.) Having no petals, or flower leaves. [See Illust. under Anther]..
Catapetalous :: Catapetalous (a.) Having the petals held together by stamens, which grow to their bases, as in the mallow..
Parapetalous :: Parapetalous (a.) Growing by the side of a petal, as a stamen..
Tetrapetalous :: Tetrapetalous (a.) Containing four distinct petals, or flower leaves; as, a tetrapetalous corolla..