Birdcage evening primrose (Oenothera deltoides) belongs to the Onagraceae (the Evening primrose family). It is an annual or a perennial herb that is distributed to the west-southern United States, from Oregon south to California and Arizona. This herb grows on the sandy places of desert, and up to a height of 5-30 cm. The leaves are grayish green, broard ovate to diamond-shaped, and form basal rosette. The flowering stalk is borne and bloom white flowers from March to May. Before sunrise, the scenery when this flower is closed seems to have scattered tissue paper. When this flower finishes pollination and it dies, it becomes like a cage basket.