onagraceous, a. [From NL. Onagra an old scientific name of the evening primrose (), fr. Gr. 'ona`gra a kind of plant; of uncertain origin.].
Pertaining to, or resembling, a natural order of plants (Onagraceæ or Onagrarieæ), which includes the fuchsia, the willow-herb (Epilobium), and the evening primrose (). [1913 Webster]