Correspondence 1 indicates that Z. K. Shinwari, et al. (Taxon 43:353--356. 1994) cite morphological and molecular evidence in support of placing the California specie of Disporum in the resurrected genus Prosartes, so that Disporum smithii (Hook.) Piper is to be treated as Prosartes smithii (Hook.) Utech, Shinwari & Kawano.
Correspondence 2 indicates that for The Jepson Manual [Ed. 2] Prosartes smithii (Hook.) Utech, Shinwari, & Kawano is to be treated as native in CA, with no infraspecific taxa recognized.