Linked from
The 8 pages that link to Cinchona, each with the reason it gives.
AlkaloidBroader topic: Its bark was the historic source of quinine and other quinoline alkaloids.
QuinineBroader topic: Its bark is the natural source from which quinine is obtained.
Medicinal plantsBroader topic: Cinchona bark supplied quinine, a landmark treatment for malaria.
Gin and tonicRelated: Cinchona bark supplied the quinine used in early tonic preparations.
Tonic waterRelated: Its bark was the original source of the quinine used in tonic water.