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.
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.
Rogers, G.K. 1987. The genera of Cinchonoideae (Rubiaceae) in the southeastern United States. J. Arnold Arb. 68: 137-183.
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.
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