Publication: Fl. N. Amer. 1: 584. 1840.
selected vouchers: WTU
Notes: H&C use the ending "a" throughout this genus, however this is incorrect due to the gender of the genus being plural neuter not singular feminine.
FNA8: "Lithophragma parviflorum is easily identified throughout its range, although morphological variation is apparent when comparing specimens from different habitats and elevations in western North America. Some authors treat L. trifoliatum as a variety of L. parviflorum."