Over 50% of prescription drugs are derived from chemicals first identified in plants.
But the Botanic Gardens Conservation International said many were at risk from over-collection and deforestation.
Researchers warned the cures for things such as cancer and HIV may become "extinct before they are ever found".
The group, which represents botanic gardens across 120 countries, surveyed over 600 of its members as well as leading university experts.
They identified 400 plants that were at risk of extinction.
Sunday, January 20, 2008
Medical plants face extinction