Chromolaena odorata (L.) R.M. King & H. Rob.

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Chromolaena odorata

Photo: Costas Zachariades

Chromolaena odorata

Photo: Costas Zachariades

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Synonyms: Eupatorium conyzoides Vahl
Eupatorium odoratum L.
Common names: Siam weed (English) Triffid weed (English)
Status: Introduced
Scrambling or climbing shrub, to 4 m (or more when supported). Leaves ovate to triangular, 3-veined from the base, gland-dotted below, smelling strongly of turpentine or paraffin when crushed. Capitula c. 10 × 3 mm, cylindric. Achenes c.5mm, straw-coloured.
Notes: Reported as definitely occurring in southern Mozambique in Zachariades et al. (2013), which also mentions unconfirmed reports of the species in northern Mozambique and Malawi. The form in southern Mozambique is the southern African biotype.
Derivation of specific name: odorata: odorous, fragrant
Altitude range:
Flowering time:
Worldwide distribution: North, Central and South America (SE USA to northern Argentina)
Mozambique distribution:
Growth form(s):
Endemic status:
Red data list status:
Insects associated with this species:
Spot characters: Display spot characters for this species

Burrows, J.E., Burrows, S.M., Lötter, M.C. & Schmidt, E. (2018). Trees and Shrubs Mozambique Publishing Print Matters (Pty), Cape Town. Page 1031. (Includes a picture).

Gautier, L. (1992). Taxonomy and distribution of a tropical weed: Chromolaena odorata (L.) R. King and H. Robinson Candollea 47

McFadyen, R. & Skarratt, B. (1996). Potential distribution of Chromolaena odorata (Siam Weed) in Australia, Africa, and Oceania. Agriculture, Ecosystems and Environment 59

Zachariades, C., Janse van Rensburg, S. & Witt, A.B.R. (2013). Recent spread and new records of Chromolaena odorata in Africa Proceedings of the Eighth International Workshop on Biological Control and Management of Chromolaena odorata and other Eupatorieae, Nairobi, Kenya, 1-2 November 2010. ARC-PPRI, Pretoria Pages 20 - 27.

Other sources of information about Chromolaena odorata:

Our websites:

Flora of Caprivi: cultivated Chromolaena odorata
Flora of Zimbabwe: Chromolaena odorata

External websites:

African Plants: A Photo Guide (Senckenberg): Chromolaena odorata
BHL (Biodiversity Heritage Library): Chromolaena odorata
EOL (Encyclopedia of Life): Chromolaena odorata
GBIF (Global Biodiversity Information Facility): Chromolaena odorata
Google: Web - Images - Scholar
iNaturalist: Chromolaena odorata
IPNI (International Plant Names Index): Chromolaena odorata
JSTOR Plant Science: Chromolaena odorata
Mansfeld World Database of Agricultural and Horticultural Crops: Chromolaena odorata
Plants of the World Online: Chromolaena odorata
Tropicos: Chromolaena odorata
Wikipedia: Chromolaena odorata

Copyright: Mark Hyde, Bart Wursten, Petra Ballings and Meg Coates Palgrave 2007-23

Hyde, M.A., Wursten, B.T., Ballings, P. & Coates Palgrave, M. (2023). Flora of Mozambique: Species information: Chromolaena odorata., retrieved 7 December 2023

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