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Conyza sumatrensis
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Astereae
Genus: Conyza
Species: C. sumatrensis
Binomial name
Conyza sumatrensis

Conyza sumatrensis is an annual herb native to North America [1] but naturalised worldwide.

In certain countries the plant has started to exhibit resistance to herbicides.[2]

In Britain, of the alien British Conyza species, this is the second most abundant (after C. canadensis) and is typically found in London and the South East of England.

Plant Details

Type Details Comments
Scientific Name Conyza sumatrensis Synonyms: Conyza albida, Conyza altissima, Conyza nandina
Common Names fleabane, tall fleabane, broad-leaved fleabane, white horseweed, Sumatran fleabane, Guernsey fleabane
Family Asteraceae
Seasonality Annual
Height 1-2 metres when fully grown (summer/autumn)
Description Flowers are white rather than purple-pink. Its leaves are like dandelion leaves, but longer, thinner and more like primrose leaves in colour and texture. Its seeding heads are like dandelions, but straw couloured and smaller. [3])
Toxicity (References needed)
Threat to other plants It poses a significant threat to wildlife conservation areas and other reserves. Its invasive nature and competitive ability could suppress the native flora in the more open habitats it favours.
Origin North America
Naturalised South America Europe Asia Australasia


  1. ^
  2. ^ resistance to herbicides
  3. ^ see

External links



Up to date as of January 23, 2010

From Wikispecies


Classification System: APG II (down to family level)

Main Page
Cladus: Eukaryota
Regnum: Plantae
Cladus: Angiospermae
Cladus: Eudicots
Cladus: core eudicots
Cladus: Asterids
Cladus: Euasterids II
Ordo: Asterales
Familia: Asteraceae
Subfamilia: Asteroideae
Tribus: Astereae
Genus: Conyza
Species: Conyza sumatrensis


Conyza sumatrensis (Retz.) E.Walker


  • Journal of Japanese Botany. [Shokubutsu Kenkyu Zasshi]. Tokyo 46:72. 1971
  • USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Data from 07-Oct-06]. [1]

Vernacular names


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