The family Onagraceae was named and described by Antoine Laurent de Jussieu in Genera Plantarum in 1789.
Plants of the World Online lists 21 accepted genera in this family of flowering plants. It is commonly known as the Willow Herb family or the Evening Primrose family. Yeah, I know, I capitalize names that others don’t. It includes species of herbs, shrubs, and trees.
The Wikipedia article mentions only 17 genera representing about 650 species. It also names several subspecies which others suggest are synonyms of the family Onagraceae.
As far as I know, so far, the only plant I am familiar with in this family is the Oenothera biennis which is the Evening Primrose.
For more information about this family of plants, please click on the links below. The links take you directly to the information about the family.