|Scientific Name:||Alternanthera sessilis|
|Species Authority:||(L.) R.Br. ex DC.|
Alternanthera denticulata R. Brown
Alternanthera nodiflora R. Brown
Alternanthera sessilis R.Br.
Gomphrena sessilis L.
Illecebrum sessile L.
|Red List Category & Criteria:||Least Concern ver 3.1|
|Reviewer/s:||Arisdason, W., Gunaga, S., Narasimhan, D. & Tognelli, M.|
|Contributor/s:||Patzelt, A., Knees, S., de Belair, G. & Lansdown, R.V.|
This species is widespread and abundant throughout most of its range with no known significant threats, it is therefore listed as Least Concern.
|Range Description:||The species occurs throughout tropical and subtropical regions of the world, but is apparently largely absent from temperate and Mediterranean regions; reports of its presence in Europe and Russia are not reliable. It occurs throughout most of Africa south of the Sahara and Egypt, throughout the Middle East, east through the Indian subcontinent, most Indian Ocean island groups, East and South-east Asia from the People's Democratic Republic of Korea south through Japan, China, Myanmar and Vietnam to Malaysia. It also occurs in Indonesia, Malaysia, Papua New Guinea, Australia, Philippines and New Zealand. It is reported as native to some of the Pacific Ocean island groups and as introduced to others. In the Western Hemisphere it is non-native in the southern United States and of uncertain origin through Central America and the Caribbean south through much of South America to Chile and Argentina. It has also been naturalized in northern and eastern parts of Spain.|
Native:American Samoa (American Samoa, American Samoa); Argentina; Australia (New South Wales, Northern Territory, Queensland, Western Australia); Bangladesh; Belize; Benin; Bhutan; Botswana; Brazil (Acre, Amazonas, Bahia, Mato Grosso do Sul, Minas Gerais, Pará, Paraná, Rio de Janeiro, Roraima, Santa Catarina, São Paulo); Burkina Faso; Cambodia; Cameroon; Cape Verde; Central African Republic; Chad; China (Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Yunnan, Zhejiang); Christmas Island; Colombia; Congo; Congo, The Democratic Republic of the; Cook Islands (Cook Is.); Costa Rica (Costa Rica (mainland)); Côte d'Ivoire; Djibouti; Dominican Republic; Ecuador (Ecuador (mainland), Galápagos); Egypt (Egypt (African part)); Equatorial Guinea; Ethiopia; Fiji; French Polynesia (Marquesas, Society Is., Tuamotu); Gabon; Gambia; Ghana; Guam; Guatemala; Guinea; Guinea-Bissau; Hong Kong; India (Andaman Is., Andhra Pradesh, Assam, Bihar, Delhi, Goa, Gujarat, Himachal Pradesh, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Mizoram, Nagaland, Nicobar Is., Orissa, Punjab, Rajasthan, Sikkim, Tamil Nadu, Tripura, Uttaranchal, West Bengal); Indonesia (Irian Jaya, Jawa); Iran, Islamic Republic of; Iraq; Israel; Jamaica; Japan (Ogasawara-shoto); Jordan; Kenya; Korea, Democratic People's Republic of; Korea, Republic of; Lao People's Democratic Republic; Lesotho; Liberia; Madagascar; Malawi; Malaysia (Peninsular Malaysia); Maldives; Mali; Marshall Islands; Mauritania; Mauritius (Mauritius (main island), Rodrigues); Mexico; Micronesia, Federated States of ; Mozambique; Myanmar (Myanmar (mainland)); Namibia (Caprivi Strip, Namibia (main part)); Nauru; Nepal; New Caledonia; New Zealand (North Is., South Is.); Nicaragua (Nicaragua (mainland)); Niger; Nigeria; Norfolk Island; Northern Mariana Islands; Oman; Pakistan; Palau; Panama; Papua New Guinea (Papua New Guinea (main island group)); Peru; Philippines; Pitcairn; Puerto Rico (Puerto Rico (main island)); Samoa; Saudi Arabia; Senegal; Seychelles (Seychelles (main island group)); Sierra Leone; Singapore; Solomon Islands (Santa Cruz Is., South Solomons); South Africa (Free State, Gauteng, KwaZulu-Natal, Limpopo Province, Mpumalanga); Sri Lanka; Sudan; Suriname; Taiwan, Province of China; Tanzania, United Republic of; Thailand; Togo; Tonga; Trinidad and Tobago; Tuvalu; Uganda; Vanuatu; Viet Nam; Wallis and Futuna; Yemen (North Yemen, Socotra, South Yemen); Zambia; Zimbabwe
Introduced:United States (Alabama, Florida, Georgia, Louisiana)
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||This species has a huge global range including both native and introduced distribution. It is probably no longer possible to be certain of its native range and consequently whether there may be different trends in native and introduced populations. However it is extremely abundant and increasing in many areas, to the extent that it is widely considered a weed.|
|Habitat and Ecology:||
This is a pioneer or ruderal species typically growing on disturbed parts of a variety of wetland habitats, often in species-rich associations with a range of other aquatic and wetland plants. It grows in the draw-down zones of water bodies or in water up to 1 m deep, where it may be part floating and part emergent or even grow in mats of floating vegetation. It is a typical plant of the floodplain wetlands, margins of rivers, streams, canals, ditches, ponds, reservoirs, tanks (in India), it will also grow in marshes, swamps, wet low-lying ground, ephemeral pools, seasonal pans and damp forest. It is a typical species of anthropogenic wetland habitats, such as damp areas in abandoned cultivation particularly in wet headlands, fallow rice fields, in seasonally waterlogged roadside depressions, on damp tracks and around villages, plantations, waste ground and even gardens. It will also grow in relatively dry situations on ditch banks or in cultivated crops. In Nigeria it is a weed of maize crops, in the Democratic Republic of the Congo it has been recorded growing in fields with sorghum, millet, Eleusine sp., maize, cotton, cassava, groundnuts and other cash crops. In the Philippines it occurs with tobacco, dryland field crops, pastures, and vegetable farms. It will grow on a range of soil types from poor sandy or alkaline soils, to loam or black cotton soils. It may extend into brackish water and estuarine habitats near the coast.
|Major Threat(s):||A. sessilis is a weed of cultivated and waste ground it is probably increasing both in range and abundance; it is not subject to any known threats.|
The species is not the subject of conservation action and there is no evidence that such action is needed.
|Citation:||Gupta, A.K. 2013. Alternanthera sessilis. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.|
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