. . . . . . . . . "Oenothera biennis" . . "Achillea millefolium" . . "Charlie Hohn. 2016. Oenothera biennis associated species with names lookup Achillea millefolium. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/2867521> on 05 Apr 2018." . . . . "http://iNaturalist.org is a place where you can record what you see in nature, meet other nature lovers, and learn about the natural world." .