Annotated by H.F. Towner (1969-70) as Calylophus drummondianus ssp. drummondianus, but cited as Calylophus berlandieri ssp. pinifolius (Engelm. ex A. Gray) Towner (Ann. Missouri Bot. Gard. 64: 107, 1977).
Annotated and previously recorded as an isotype of Oenothera capillifolia Scheele (Linnaea 21: 576, 1848), apparently in error.