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Visible, a few yards past the east entrance.
San Diego County, California, US
Large four petalled yellow flower. Grew on stalks reaching up to 3 meters high.
Oenothera elata is a plant of the genus Oenothera known by the common name Hooker's evening primrose. Its subspecies include hookeri, hirsutissima and elata. It is native to much of western and central North America.