Delprete, P. G. ., and J. H. . Kirkbride, Jr. “Schradera Involucrata Is the Correct Name for Spermacoce Scandens (Rubiaceae)”. Journal of the Botanical Research Institute of Texas, vol. 11, no. 1, July 2017, pp. 121-2, doi:10.17348/jbrit.v11.i1.1143.