evening primrose

Short definition from Wiktionary

Noun

1. 1
   Any of various flowering plants of the genus Oenothera or Camissonia, in the family Onagraceae,
2. 2
   Any of various flowering plants of the genus Oenothera or Camissonia, in the family Onagraceae,: especially the common evening primrose, Oenothera biennis.
3. 3
   Any plant of family Onagraceae, the evening primrose family.
4. 4
   Alternative form of evening primrose.