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Chromolaena odorata: Wikis


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Siam Weed
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Eupatorieae
Genus: Chromolaena
Species: C. odorata
Binomial name
Chromolaena odorata
(L.) King & H.E. Robins.

Eupatorium odoratum
Osmia odorata (L.) Sch.Bip.

Indian Cabbage White Pieris canidia on Chromolaena odorata at Samsing in Darjeeling district of West Bengal, India.

Chromolaena odorata is a shrub of the sunflower family native to North America, from Florida and Texas to Mexico and the West Indies.[1] It is an invasive weed of field crops in Africa and Asia where it has been introduced. It is now found all over tropical Asia, western Africa, and in parts of Australia. Other names for the plant include Siam weed and Christmas bush, and Common Floss Flower. It is sometimes grown as a medicinal and ornamental plant. It is used as a traditional medicine in Indonesia. The young leaves are crushed, and the resulting liquid can be used to treat skin wounds.

It was earlier taxonomically classified under the genus Eupatorium, but is now considered more closely related to other genera in the tribe Eupatorieae.[2]

Chromolaena odorata has been reported to be the most problematic invasive species within protected rain forests in Africa.[3]



Chromolaena odorata contains tumorigenic pyrrolizidine alkaloids.[4]


  1. ^ "Chromolaena odorata". Flora of North America.  
  2. ^ GJ Schmidt, EE Schilling (May 2000). "Phylogeny and Biogeography of Eupatorium (Asteraceae: Eupatorieae) Based on Nuclear ITS Sequence". American Journal of Botany 87 (5): 716–726. doi:10.2307/2656858. PMID 10811796.  
  3. ^ TT Struhsaker, PJ Struhsaker, KS Siex (May 2005). "Conserving Africa’s rain forests: problems in protected areas and possible solutions" (PDF). Biological Conservation 123 (1): 45-54. ISSN 0006-3207.  
  4. ^ Fu, P.P., Yang, Y.C., Xia, Q., Chou, M.C., Cui, Y.Y., Lin G., "Pyrrolizidine alkaloids-tumorigenic components in Chinese herbal medicines and dietary supplements", Journal of Food and Drug Analysis, Vol. 10, No. 4, 2002, pp. 198-211[1]

Further reading

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