. . . . . . . . . "Sambucus nigra caerulea" . . "Opuntia littoralis" . . "Christian Schwarz. 2016. Sambucus nigra caerulea associated species with names lookup Opuntia littoralis. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/2820328> 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." .