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Citation

USDA 2012: United States Department of Agriculture, Agricultural Research Service, National Genetic Resources Program. Germplasm Resources Information Network (GRIN) [Internet]. Echinacea angustifolia DC. Beltsville (MD): National Germplasm Resources Laboratory. Available from: http://www.ars-grin.gov/cgi-bin/npgs/html/tax_search.pl [Last updated 2012 March 08; Accessed 2013 January 30].