Urbatsch, L. E.; Roberts, R. P.; Karaman, V. (2003). “Phylogenetic evaluation of Xylothamia, Gundlachia, and related genera (Asteraceae, Astereae) based on ETS and ITS nrDNA sequence data”. American Journal of Botany. 90 (4): 634–49. doi:10.3732/ajb.90.4.634. PMID21659159.
Urbatsch, L. E.; Roberts, R. P.; Karaman, V. (2003). “Phylogenetic evaluation of Xylothamia, Gundlachia, and related genera (Asteraceae, Astereae) based on ETS and ITS nrDNA sequence data”. American Journal of Botany. 90 (4): 634–49. doi:10.3732/ajb.90.4.634. PMID21659159.