Heracleum maximum W. Bartram. Masterwort, Cow-parsnip, American Hogweed. Phen: May-Jul; Jul-Aug. Hab: Northern hardwood forests, roadbanks, meadows, forest openings, grassy balds, rich floodplain forests. Dist: NL (Labrador) west to AK, south to DE, PA, OH, IN, IL, MO, KS, NM, AZ, CA, and in the Appalachians south to w. NC, e. TN, and n. GA; also in e. Siberia.
Origin/Endemic status: Native
Syn: = F, GW2, Il, K1, K3, K4, Mi, NE, Tn, Va, WV; = Heracleum lanatum – C, G, MC, Pa, RAB, W; = Heracleum sphondylium ssp. montanum – GrPl, Mo2