| Oleaceae | |
Forsythia × intermedia var. densiflora
| Koehne | Späths Katal. 1899–1900: | 1900 |
| Oleaceae | |
Forsythia × intermedia var. divaricata
| Koehne | Späths Katal. 1899–1900: | 1900 |
| Oleaceae | |
Forsythia × intermedia var. primulina
| Rehder | Mitt. Deutsch. Dendrol. Ges. 21: 193 | 1912 |
| Oleaceae | |
Forsythia × intermedia var. spectabilis
| (Koehne) Spath | Mitt. Deutsch. Dendrol. Ges. 16: 216 | 1907 |
| Oleaceae | |
Forsythia × intermedia var. vitellina
| Koehne | Späths Katal. 1899–1900: | 1900 |