(Breedlove & Heckard) T.I.Chuang & Heckard 1991 - Chuang TI, Heckard LR (1991) Generic Realignment and Synopsis of Subtribe Castillejinae (Scrophulariaceae-Tribe Pediculareae). Systematic Botany 16: 644-666. doi: 10.2307/2418868.