Monographs Details: Cinchona macrocalyx Pav. ex DC. x C. rugosa Pav.
Authority: Andersson, Lennart. 1998. A revision of the genus (Rubiaceae--Cinchoneae). Mem. New York Bot. Gard. 80: 1-75.
Family:Rubiaceae
Discussion:A case of extensive hybridization between C. macrocalyx and C. rugosa was discussed by Camp (1949: 419).