| Oleaceae | |
Forsythia japonica fo. densiflora
| (Nakai) Markgr. | Repert. Spec. Nov. Regni Veg. 35: 45 | 1934 |
| Oleaceae | |
Forsythia japonica fo. ovata
| (Nakai) Markgr. | Repert. Spec. Nov. Regni Veg. 35: 45 | 1934 |
| Oleaceae | |
Forsythia japonica fo. saxatilis
| (Nakai) Markgr. | Repert. Spec. Nov. Regni Veg. 35: 45 | 1934 |
| Oleaceae | |
Forsythia japonica var. saxatilis
| Nakai | Bot. Mag. (Tokyo) 32: 10 | 1919 |
| Oleaceae | |
Forsythia japonica var. subintegra
| H. Hara | J. Jap. Bot. 39: 132 | 1964 |