Conyza sumatrensis

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
(Retz.) E. Walker
Synonyms
  • Conyza groegeri V.M.Badillo
  • Erigeron sumatrensis Retz.
  • Conyza albida Willd. ex Spreng.
  • Erigeron albidus (Willd. ex Spreng.) A.Gray

Conyza sumatrensis is an annual herb probably native to South America, but widely naturalised in tropical and subtropical regions, and regarded as an invasive weed in many places.[1][2] In the British Isles it is known as Guernsey fleabane.[3]

In certain countries the plant has started to exhibit resistance to herbicides.[4]

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. It was first recorded in London by Brian Wurzell in 1984,[5] and noted in France at Saint-Sozy (Dordogne) in 2006.[6]

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 coloured and smaller.[7]
Toxicity
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[8]
Africa[9]
Asia[10]
Australasia[11]

References

  1. Flora of China, 苏门白酒草 su men bai jiu cao Erigeron sumatrensis Retzius
  2. Pruski, J.F. & G. Sancho. 2006. Conyza sumatrensis var. leiotheca (Compositae: Astereae), a new combination for a common neotropical weed. Novon 16(1): 96–101
  3. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
  4. Sumatran Fleabane, Weedscience.org
  5. Fleabane in London
  6. Mark Galliott (June 2006). "France – The Dordogne" (PDF). Tour Report. Naturetrek Wildlife Holidays. Archived from the original (PDF) on 2007-09-29. Retrieved 2011-10-18.
  7. See pictures at International Environmental Weed Foundation
  8. Fleabane in Holland
  9. Flora of Zimbabwe: Conyza sumatrensis
  10. Sumatran Fleabane in Japan
  11. Pacific Island Ecosystems at Risk (PIER): Conyza sumatrensis

External links

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