Diterpenes: A bitter tasting terpenoid used widely as a stomachic. Diterpenes are believed to help with hypertension and respiratory tract complaints such as catarrh bronchitis and colds. Some diterpenes are believed to have tumour inhibitor properties as well as a stimulating effect on the immune system.
Flavonoids: Flavonoids occur (as white and yellow plant pigments found almost as commonly as chlorophyll) as Glycosides or in a free state. In plants it is essential for protecting plant tissue from UV radiation and acts as antioxidants. As pigments it is also responsible for Autumn colors in leaves and yellow/red pigmentation in flowers.