. . . . . . . . . "Cirsium occidentale" . . "Pinus sabiniana" . . "terrydad2. 2011. Cirsium occidentale associated species with names lookup Pinus sabiniana. iNaturalist.org. Accessed at <https://www.inaturalist.org/observations/3240028> 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." .