''Chromolaena odorata'' is also known as Jack in the Bush. It is a tropical and subtropical species of

flowering Flowers, also known as blooms and blossoms, are the reproductive structures of flowering plants ( angiosperms). Typically, they are structured in four circular levels, called whorls, around the end of a stalk. These whorls include: calyx, m ...

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

in the family

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

. It is native to the

Americas The Americas, sometimes collectively called America, are a landmass comprising the totality of North America and South America.''Webster's New World College Dictionary'', 2010 by Wiley Publishing, Inc., Cleveland, Ohio. When viewed as a sing ...

, from

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

and

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

in the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

south through

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

and the

Caribbean The Caribbean ( , ; ; ; ) is a region in the middle of the Americas centered around the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean, mostly overlapping with the West Indies. Bordered by North America to the north, Central America ...

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

. It has been introduced to tropical

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

West Africa West Africa, also known as Western Africa, is the westernmost region of Africa. The United Nations geoscheme for Africa#Western Africa, United Nations defines Western Africa as the 16 countries of Benin, Burkina Faso, Cape Verde, The Gambia, Gha ...

, and parts of

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

. Common names include Siam weed, rouge plant, Christmas bush, jack in the box, devil weed, common floss flower, hagunoy (

Cebuano language Cebuano ( )Cebuano
on Merriam-Webster.com is an Austronesian languages, Austronesian language spoken i ...

), rompe saragüey (

Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many countries in the Americas **Spanish cuisine **Spanish history **Spanish culture ...

), Abani di egwu or Nsiibilibe (

Igbo language Igbo ( , ; Standard Igbo: ''Ásụ̀sụ́ Ìgbò'' ) is the principal native language cluster of the Igbo people, an ethnicity in the Southeastern part of Nigeria. Igbo languages are spoken by a total of 31 million people. The number of Igbo ...

), ewé Akíntọ́lá (

Yorùbá Yoruba may refer to: * Yoruba people, an ethnic group of West Africa * Yoruba language, a West African language of the Volta–Niger language family * Yoruba alphabet, a Latin alphabet used to write in the Yoruba language * Yoruba religion, West A ...

) and

triffid The triffid is a List of fictional plants, fictional tall, mobile, carnivorous plant species, created by John Wyndham in his 1951 novel ''The Day of the Triffids'', which has since been adapted for film and television. The word "triffid" has ...

.Lalith Gunasekera, ''Invasive Plants: A guide to the identification of the most invasive plants of Sri Lanka'', Colombo 2009, p. 116–117.

Description

''Chromolaena odorata'' is a rapidly growing perennial herb. It is a multi-stemmed shrub which grows up to 2.5 m (100 inches) tall in open areas. It has soft stems but the base of the shrub is woody. In shady areas it becomes etiolated and behaves as a creeper, growing on other vegetation. It can then become up to 10 m (33 feet) tall. The plant is hairy and

glandular A gland is a cell or an organ in an animal's body that produces and secretes different substances that the organism needs, either into the bloodstream or into a body cavity or outer surface. A gland may also function to remove unwanted substance ...

and the leaves give off a pungent, aromatic odour when crushed. The leaves are opposite, triangular to elliptical with

serrated Serration is a saw-like appearance or a row of sharp or tooth-like projections. A serrated cutting edge has many small points of contact with the material being cut. By having less contact area than a smooth blade or other edge, the applied pr ...

edges. Leaves are 4–10 cm long by 1–5 cm wide (up to 4 x 2 inches). Leaf petioles are 1–4 cm long. The white to pale pink tubular flowers are in

panicles In botany, a panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a p ...

of 10 to 35 flowers that form at the ends of branches. The seeds are

achenes An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not open ...

and are somewhat hairy. They are mostly spread by the wind, but can also cling to fur, clothes and machinery, enabling long-distance dispersal. Seed production is about 80,000 to 90,000 per plant. Seeds need light to germinate. The plant can regenerate from the roots. In favorable conditions the plant can grow more than 3 cm per day.

Classification

It was earlier taxonomically classified under the genus ''

Eupatorium ''Eupatorium'' is a genus of flowering plants in the family Asteraceae, containing from 36 to 60 species depending on the classification system. Most are Herbaceous plant, herbaceous perennial plant, perennials growing to tall. A few are shrubs ...

'', but is now considered more closely related to other genera in the tribe

Eupatorieae Eupatorieae is a Tribe (biology), tribe of over 2000D.J.N.Hind & H.E.Robinson. 2007. Tribe Eupatorieae In: ''The Families and Genera of Vascular Plants'' vol.VIII. (Joachim W.Kadereit & Charles Jeffrey, volume editors. Klaus Kubitzky, general edi ...

Chromolaena odorata seeds vijayan rajapuram

Invasive species

''Chromolaena odorata'' is considered an invasive weed of field crops and natural environments in its introduced range. It has been reported to be the most problematic invasive species within protected rainforests in

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

. In Western Africa it prevents regeneration of tree species in areas of shifting cultivation. It affects species diversity in southern Africa. The plant's flammability affects forest edges. In

Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

it is a major weed in disturbed areas and coconut plantations.

Control

Biological control with a defoliating Arctiid moth was attempted in the 1970s. A pilot study in the Ashanti region of Ghana introduced the moth '' Pareuchaetes pseudoinsulata'' to some effect. In Australia a systematic eradication programme with herbicide has been initiated. The gall forming tephritid fly '' Cecidochares connexa'' was introduced into Guam from Indonesia in 1998 and is widespread across the island. ''Chromolaena odorata'' forms galls around the fly larvae that become a nutrient sink that diverts energy away from plant growth to provide nutritive tissue along the walls of the larval chamber. Between 1 and 7 larvae can be found in each gall.

History of introduction

In the nineteenth century ''Chromolaena odorata'' escaped from the botanical gardens at

Dacca Dhaka ( or ; , ), List of renamed places in Bangladesh, formerly known as Dacca, is the capital city, capital and list of cities and towns in Bangladesh, largest city of Bangladesh. It is one of the list of largest cities, largest and list o ...

(Bangladesh), Java (Indonesia) and

Peradeniya Peradeniya (; ) is a suburb of the city of Kandy, Sri Lanka with about 30,000 inhabitants. It is situated on the A1 main road, a few kilometres west of Kandy city centre. Peradeniya's name is derived from ''pera'' (guava) and ''deniya'' (a plain ...

(Sri Lanka). In Western Africa the plant was accidentally introduced with forestry seeds. It was introduced as an ornamental in Southern Africa, and was introduced to Ivory Coast in 1952 to control

Imperata ''Imperata'' is a small but widespread genus of tropical and subtropical grasses, commonly known as satintails. Satintail grass species are perennial rhizomatous herbs with solid, erect stems and silky inflorescences. The best known species is ...

grasses. It was first found in Queensland, Australia in 1994 and was perhaps introduced with foreign pasture seeds. ''Chromolaena odorata'' was found on the eastern portion of the Big Island of Hawai'i in 2021.

Uses

The plant is referred to a
"rompe saragüey"
by practitioners of Santeria, who use it for spiritual purposes. This use was famously mentioned in the

salsa Salsa most often refers to: * Salsa (food), a variety of sauces used as condiments * Salsa music, a popular style of Latin American music * Salsa (dance), a Latin dance associated with Salsa music Salsa or SALSA may also refer to: Arts and ent ...

song "Rompe Saragüey" by

Héctor Lavoe Héctor Juan Pérez Martínez (September 30, 1946 – June 29, 1993), better known as Héctor Lavoe, was a Puerto Rican people, Puerto Rican salsa music, salsa singer. Widely regarded as one of salsa’s most important and influential vocalist ...

. ''C. odorata'' is commonly used in Latin America as an

incense Incense is an aromatic biotic material that releases fragrant smoke when burnt. The term is used for either the material or the aroma. Incense is used for aesthetic reasons, religious worship, aromatherapy, meditation, and ceremonial reasons. It ...

to spiritually cleanse a household, especially in

Santería Santería (), also known as Regla de Ocha, Regla Lucumí, or Lucumí, is an African diaspora religions, Afro-Caribbean religion that developed in Cuba during the late 19th century. It arose amid a process of syncretism between the traditional ...

Cuba Cuba, officially the Republic of Cuba, is an island country, comprising the island of Cuba (largest island), Isla de la Juventud, and List of islands of Cuba, 4,195 islands, islets and cays surrounding the main island. It is located where the ...

and

Puerto Rico ; abbreviated PR), officially the Commonwealth of Puerto Rico, is a Government of Puerto Rico, self-governing Caribbean Geography of Puerto Rico, archipelago and island organized as an Territories of the United States, unincorporated territo ...

Toxicity

''Chromolaena odorata'' is toxic to cattle and is larvicidal against all major mosquito vectors. It can also cause allergic reactions.”Siam weed or chromolaena (Chromolaena odorata)” Weed Management Guide at http://www.environment.gov.au/biodiversity/invasive/weeds/publications/guidelines/alert/pubs/c-odorata.pdf

References

External links

* *
Queensland Government Factsheet
* {{Authority control odorata Medicinal plants of Central America Flora of Texas Flora of Florida Flora of Mexico Flora of Southern America Plants described in 1759 Invasive plant species in Sri Lanka Medicinal plants of North America Flora without expected TNC conservation status