| Subject | English | Italian |
| agric. | bitter orange tree | arancio amaro (Citrus aurantium) |
| agric. | bitter orange tree | melangolo (Citrus aurantium, Citrus aurantium var.bigaradia) |
| bot. | common orange tree | arancio Citrus sinensis |
| agric. | mandarin-orange tree | mandarino (Citrus deliciosa, Citrus nobilis, Citrus reticulata) |
| med. | orange tree | arancio (citrus aurantium) |
| med. | orange-tree | arancio (citrus aurantium) |
| nat.sc., agric. | Osage orange tree | osage-orange (Maclura aurantiaca, Maclura pomifera) |
| agric. | Seville orange tree | melangolo (Citrus aurantium, Citrus aurantium var.bigaradia) |
| agric. | Seville orange tree | arancio amaro (Citrus aurantium, Citrus aurantium var.bigaradia) |
| agric. | sour orange tree | arancio amaro (Citrus aurantium) |
| agric. | sour orange tree | melangolo (Citrus aurantium, Citrus aurantium var.bigaradia) |
| life.sc., agric. | sweet orange tree | arancio |
| agric. | tangerine-orange tree | mandarino (Citrus deliciosa, Citrus nobilis, Citrus reticulata) |