Species. Chromolaena odorata is a deciduous sub-shrub in North America.

& Robinson, H.E. This plant is actually one of the weeds plants or parasites that comes from the Asteraceae family. Distinguishing features.

A perennial scrambling shrub, growing up to a height of 5 m when support is available. Chromolaena odorata is a fast-growing perennial shrub, native to South America and Central America. Siam weed (Chromolaena odorata) may occasionally be confused with Senegal tea plant (Gymnocoronis spilanthoides), crofton weed (Ageratina adenophora) and mistflower (Ageratina riparia). Scrambling shrub to 7 m tall, often around 4 m tall. It has been introduced into the tropical regions of Asia, Africa and the Pacific, where it is an invasive weed. Verkley2 and Pedro W. Crous2* 1ARC-PPRI, Weeds Research Division, P/Bag X5017, Stellenbosch, 7599 South Africa; current address: University of Florida, Plant Pathology Dept. Leaves opposite, triangular with 3 conspicuous main veins, margins coarsely toothed. (It is a shrub in the tropics.) King & H. Robinson . Family Asteraceae Scientific Name Chromolaena odorata (L.) R.M.King & H.Rob.
Asteraceae (Aster Family) Synonym(s): Eupatorium odoratum, Osmia odorata USDA Symbol: CHOD USDA Native Status: L48 (N), PR (N), VI. Family: Asteraceae Synonyms: Eupatorium odoratum L. Common names: Siam Weed, Bitter bush, Herbe du Laos, Feijiçao. Flower head white, pink to mauve, disc florets only. Chromolaena odorata . King, R.M. Chromolaena odorata Siamweed This plant can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. CHROMOLAENA ODORATA (L.) R.M. Fungal Diversity 89 Morphological and molecular characterisation of Mycosphaerellaceae associated with the invasive weed, Chromolaena odorata Alana den Breeÿen1, Johannes Z. Groenewald2, Gerard J.M. Common name. Also known as Siam weed, it forms dense stands that prevent the establishment of other plant species. Stem round in cross-section. Flowers white to mauve.

Branched stems curve upward and are 2-6 ft. in height.

Not only that, the leaves have a rather rough texture, different than the other types of leaves.
It is an aggressive competitor and may have allelopathic effects. Common name(s) Siam Weed. The shoots dry up after flowering in December-January in the Northern Hemisphere, coinciding with the dry season, and become a fire … Aromatic when crushed. Type: . (1970) Phytologia 20(3): 204. Seeds with a pappus of fine bristles. Simple, entire or toothed, triangular, 4.5-12 x 20-55 mm; upperside hairy; underside densely hairy, dotted with glands … Flower colour; life form. 1453 …

FAMILY. Weed * Stem.

Asteraceae. Siam weed. As for the characteristics of the leaves are they comes in the shape of oval and jagged on the edges. Shrub to 7 m tall, scrambling. Leaves.