Robert W. Freckmann Herbarium


Because of technology changes and personnel changes at UWSP and the Wisconsin State Herbarium, the database of plant species housed at this site was merged with the database from the OLD WisFlora website to create a new Flora of Wisconsin website at Currently we are encouraging all Wisplant viewers to begin using the Flora of Wisconsin website as soon as possible. Wisplants will remain operational through July 13th. After that date, all traffic to Wisplants will be redirected to the Flora of Wisconsin website.

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  Heracleum mantegazzianum Sommier & Levier image
Photographer: (MDAR) Mass. Dept. of Ag. Resources           

Massachusetts Dept. of Agricultural Res.
Family Apiaceae
Heracleum mantegazzianum Sommier & Levier
giant hogweed
Heracleum: named for Hercules, who was supposed to have used it first for medicine
mantegazzianum: for Paolo Mantegazzi, 19th century Italian etnographist
Hazardous hazard symbol- click for definition   Prohibited Invasive - Eradicate!  Stop It symbol- click for definition
County distribution map- click for detailed distribution maps.
Detailed Distribution:
Town Range Maps
Google Dot Maps
Status: Introduced - locally established; potentially invasive
Plant: erect, biennial/perennial, 10'-15' tall forb; stems hollow, dark reddish-purple, hairy, each of the hairs surrounded by a purplish raised node; tuberous roots
Flower: white, 5-parted; inflorescence a flat, many-branched umbel up to 20" wide; blooms May-July
Leaf:deeply palmately cut, up to 5' wide, underside with coarse hairs, stalk spotted
Notes: The 2003 Guinness Book of Records recognizes Giant Hogweed as the largest weed in the world.

More Information Natural Communities Herbarium Specimens
All Heracleum list Google- Images or Text
There are no synonyms for this taxon.

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