Euphrasia williamsii B.L. Robinson var. williamsii
Euphrasia williamsii B.L. Robinson var. williamsii is a synonym sensu TROPICOS of:
Euphrasia oakesii var. williamsii (B.L. Robinson) Gussarova, an accepted variety name sensu FNA Ed. Comm., 2019.
Euphrasia williamsii B.L. Robinson var. williamsii is a synonym sensu TROPICOS of:
Euphrasia oakesii var. williamsii (B.L. Robinson) Gussarova, an accepted variety name sensu FNA Ed. Comm., 2019.