Den virtuelle floraen -Naturhistoriska Riksmuseet (svensk) «Plant» fra . The Virtual Library of Botany Catholic University of Leuven – «High quality pictures of plants and information about them». Curtis's Botanical Magazine, 1790–1856 The Trees Of Great Britain and Ireland, av Henry John Elwes og Augustine Henry, 1906–1913 Botanik-Datenbank – tyskspråklig ressurs. Plant Directory – tyskspråklig ressurs. USDA plant database The Linnean Society of London Native Plant Information Network Directory of Plants – oversikt i PDF.