Description: close up image of Oenothera biennis COMMON EVENING PRIMROSE at the James Woodworth Prairie Preserve - single specimen showing upper leaves and flower heads. Date: 28 November 2005, 17:59. Source: Oenothera biennis COMMON EVENING PRIMROSE Uploaded by uleli. Author: Frank Mayfield from Chicago area, USA. Camera location42° 03′ 35.02″ N, 87° 50′ 29″ WView all coordinates using: OpenStreetMap 42.059728; -87.841389.