For Erithalis
Negrón-Ortiz, V., 2005. Taxonomic revision of the neotropical genus: Erithalis (Rubiaceae: Chiococceae). Sida 21: 1565-1598.
Negrón-Ortiz, V., and L.E. Watson. 2002. Molecular phylogeny and biogeography of Erithalis (Rubiaceae), an endemic of the Caribbean Basin. Plant Syst. Evol. 234: 71-83.
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