⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Onagra biennis in version 1.1 of The Plant List.
This name is a synonym of Oenothera biennis f. grandiflora .
The record derives from Tropicos which reports it as a synonym (record 50129855
) with original publication details: Edwards's Bot. Reg. 19: pl. 1604 pl. 1604 1833.