T.I.Chuang & Heckard 1992 - Chuang TI, Heckard LR (1992) New Species of Bee-Pollinated Castilleja from Peru, with a Taxonomic Revision of South American Members of subg. Colacus. Systematic Botany 17: 417-431. doi: 10.2307/2419482.
No known synonyms