Tsan Lang Chuang, Heckard, LR, Systematics and evolution of Cordylanthus (Scrophulariaceae-Pedicularieae) (including the taxonomy of subgenus Cordylanthus), Systematic Botany Monographs vol. 10: 1-105 (1986)
 
1013012 274280 Cordylanthus frutescens Blume C.L. Blume, Mus. Bot., vol. 2 : p. 2, t. 3 (1852-1857)
 
383512 274286 Cordylanthus kingii S. Watson S. Watson, D.C. Eaton, Botany [fortieth parallel], vol. 5 : t. 22 (1871)