桃金孃科多瓣桃木属 Octamyrtus Diels, 1922 Olythia Steud., 1841 Opa Lour., 1790 八宫花属 Osbornia F.Muell., 1862 凹果岗松属 Oxymyrrhine Schauer, 1843 Palaeorhodomyrtus E.M.Reid
军配飞虱科Oligaethus Jacobi, 1928 Ommatissus Fieber, 1875 Opatissus Asche & Wilson, 1989 Osbornia Ball, 1910 Ossoides Bierman, 1910 Padanda Distant, 1906 Paraepora Chang