Vascular Plants of North Carolina
Account for Giant Hogweed - Heracleum mantegazzianum   Sommier & Levier
Members of Heracleum with account distribution info or public map:
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Section 6 » Order Apiales » Family Apiaceae
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AuthorSommier & Levier
DistributionA single collection is known: a roadside drainage ditch in Watauga County, in 2011. See the original report in Poindexter et al. (2011).

Native of the Caucasus Mountains; in N.A. maritime Canada to Ont., south to NC, IL, MN; also OR, WA, B.C.
AbundanceVery rare. Only a single plant was found and it was eradicated. This is a Federal Noxious Weed.
HabitatRoadside drainage ditch.
PhenologyFlowering and fruiting June-August.
IdentificationGiant Hogweed is very robust, often growing 6-9 feet tall and with very thick hollow stems. Compared to the native Cow-parsnip (H. maximum), it has more rays per umbel (50-150 rays vs. 15-45 rays in the native species) and stems to a whopping 6 inches in diameter (vs. a maximum of 2 inches in diameter in H. maximum -- a very large plant in itself!). Both have highly dissected, large leaves and large, domed white umbels; most other umbel species have dissected leaves and white umbels, but these two species are giants compared with most others.
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Global RankG4?
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