Plant terpenoids are often used for their scent. They are used in traditional herbal remedies. Terpenoids help the scent of eucalyptus, the flavors of cinnamon, cloves, and ginger, the yellow color in sunflowers, and the red color in tomatoes. Well-known terpenoids include citral, menthol, camphor, salvinorin A in the plant Salvia divinorum, the cannabinoids found in cannabis, ginkgolide and bilobalide found in Ginkgo biloba, and the curcuminoids found in turmeric and mustard seeds.
- Firn, Richard (2010). Nature's chemicals. Oxford: Biology.
- Michael Specter (September 28, 2009). "A life of its own". The New Yorker.