Giant Sumpweed
Iva xanthifolia NuttallAsteraceae

common name synonyms: Giant Marshelder, Horseweed, Marshelder, False Ragweed, Burweed Marshelder

scientific name synonyms: Cyclachaena xanthifolia

subclass: Dicotyledoneae

superorder: Asteridae

order: Asterales

growth form: herb

life history: annual

level of invasiveness: naturalized

weedy in native range: Yes

noxious weed in the u.s.: Yes

type of introduction: Accidental

number of vectors: 4.0

introduced range: Europe, France, Britain

native range: North America

notes: naturalized in E.C. and S.C. Europe, casual elsewhere, found in cult. ground, railway lines and waste places; noxious weed, invasive weed in U.S. (PUSDA); currently imported w/ cereal (Sykora 1990); a persistent bird seed, grain carrot seed and woolalian, perhaps established on the beach in W. Kent and by the river Gipping at E. Suffolk

invasiveness notes: naturalized

Credits: Credits: (c) 2001-2006 J. Forman Orth