Plants — Q
- Quassia amara Quassia Wood
- Quercus acutissima Bristle Oak
- Quercus alba
- Quercus brantii Brant Oak
- Quercus castaneifolia
- Quercus durata
- Quercus frainetto Hungarian oak
- Quercus infectoria Aleppine Oak
- Quercus libani Lebanese Oak
- Quercus robur Common Oak
- Quercus velutina
- Quillaja saponaria Murillo's-bark