References
For Rubiaceae
Bremer, B., and T. Eriksson. 2009. Time tree of Rubiaceae: phylogeny and dating the family, subfamilies, and tribes. Int. J. Plant Sci. 170: 766-793. Google Scholar
Paudyal, S.K., P.G. Delprete, S. Neupane, and T.L. Motley. 2018. Molecular phylogenetic analysis and generic delimitations in tribe Chiococceae (Cinchonoideae, Rubiaceae). Bot. J. Linn. Soc. 187: 365-396. Google Scholar
Rogers, G.K. 1987. The genera of Cinchonoideae (Rubiaceae) in the southeastern United States. J. Arnold Arb. 68: 137-183. Google Scholar
Rogers, G.K. 2005. The genera of Rubiaceae in the southeastern United States, part II. Subfamily Rubioideae, and subfamily Cinchonoideae revisited (Chiococca, Erithalis, and Guettarda). Harvard Papers in Botany 10: 1-45. Google Scholar