1. Bernal R. Gradstein S.R. Celis M. 2015. In: Catálogo de plantas y líquenes de Colombia. Bogotá: Instituto de Ciencias Naturales Universidad Nacional de Colombia. http://catalogoplantasdecolombia.unal.edu.co
2. Clay, H.F., Hubbard, J.C., 1987. The Hawaii garden: tropical shrubs.Honolulu, Hawaii, USA: University of Hawaii Press.
3. Daniel T.F. Chuang T.I. 1998. Chromosome numbers of cultivated Acanthaceae and systematic implications. In: Diversity and Taxonomy of Tropical Flowering Plants [ed. by Mathew P. Sivadasan M.]. Calicut India: Mentor Books. 309-330.
4. Darbyshire, I., Vollesen, K., Kelbessa, E., 2015. Flora Zambesiaca, 8(6)
5. Dave's Garden 2019. In: Dave's garden. El Segundo California USA: Internet Brands. http://davesgarden.com