What is the meaning of Evening_primrose?

Any of various flowering plants of the genus Oenothera or Camissonia, in the family Onagraceae,

  1. especially the common evening primrose, Oenothera biennis.

especially the common evening primrose, Oenothera biennis.

Any plant of family Onagraceae, the evening primrose family.

Source: wiktionary.org