http://www.ars.usda.gov/Services/docs.htm?docid=9943 USDA-ARS: Larkspur—Delphinium spp. Fact Sheet larkspur larkspur USDA-ARS Larkspur Fact Sheet USDA-ARS: Larkspur—Delphinium spp. Fact Sheet larkspur larkspur http:/www.ars.usda.gov/Services/docs.htm?docid=9943