*[http://www.biodiversitylibrary.org/search.aspx?SearchTerm=Heracleum%20sphondylium&SearchCat= BHL]
*[http://ecocrop.fao.org/ecocrop/srv/en/cropFindForm FAO Ecocrop]
*[http://www.feedipedia.org/ Feedipedia]
*[https://npgsweb.ars-grin.gov/gringlobal/taxonomydetail.aspx?id=70346 GRIN]
*[http://www.ipni.org/ipni/simplePlantNameSearch.do?find_wholeName=Heracleum%20sphondylium&output_format=normal&query_type=by_query&back_page=query_ipni.html IPNI]
*[http://mansfeldnaeb.ipk-gaterslebenbrit.deorg/plsuses/htmldb_pgrcsearch/f?p=185:45:1329164412874601::NO::P7_BOTNAME,P7_DB_CHECKBOX1,P7_DB_CHECKBOX2,P7_DB_CHECKBOX4:Heracleum%20sphondylium,,, Mansfeld]*[http://herb.umd.umich.edu/herb/search.pl?searchstringstring=Heracleum%20sphondylium +sphondylium Moerman, Native American Ethnobotany]
*[http://www.plantnames.unimelb.edu.au/Sorting/Heracleum.html Multilingual Plant Name Database]
*[http://www.theplantlist.org/tpl1.1/search?q=Heracleum+sphondylium Plant List]