. . . "Oenothera spachiana Torr. and A. Gray" . "Spach's Evening Primrose" . . "Torr. and A. Gray" . . . . "Onagraceae" . "Magnoliophyta" . . . . "Magnoliopsida" . "Myrtales" . "Oenothera spachiana" . "Plantae" . "Oenothera" . . . .