Quinine bush may refer to several flowering plant species:
- Alstonia constricta, an Australian endemic plant in the family Apocynaceae.
- Garrya wrightii, a plant native to Mexico and the USA, in the family Garryaceae.
- Petalostigma pubescens, a rainforest tree native to Papua New Guinea and Australia, in the family Picrodendraceae.
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