Invasives

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Species Description Photo
Abelmoschus moschatus (Fautia) Abelmoschus moschatus is a weedy, herbaceous plant that is native to India, parts of China and tropical Asia, and some Pacific islands. It is cultivated in India for the musk-like oil contained in its ...
Abrus precatorius (jequerity) Abrus precatorius a legume, is a nitrogen fixer and where present in large stands can alter soil nutrient status. It is also suspected to have allelopathic effects that could alter native speci ...
Acacia concinna (Soap Pod) Acacia concinna is a tree native to Asia. It is found in disturbed forests, in meadows and along rivers. Introduced to New Caledonia in the late 1980s, Acacia concinna has become locally invasive. ...
Acacia confusa (pilampwoia) Acacia confusa, a native of northern Philippines, has been introduced to many places throughout Asia and the Pacific. Being well suited to warm moist environments it has become invasive in many ...
Acacia farnesiana (Ellington curse) Probably a native of tropical America, Acacia farnesiana was introduced to many tropical countries for its bark, gum, seed and wood. It is often planted as an ornamental or to check erosion, and is al ...
Acacia longifolia (western yarrow) Acacia longifolia is a shrub or small tree that is part of the nitrogen-fixing Acacia family. Native to the South-eastern coast of Australia, it has naturalised in many other places and has become inv ...
Acacia mangium (Hickory Wattle) Acacia mangium is a fast-growing tree that produces many seeds. Used for forestry and ecological restoration, it was widely planted and cultivated in many Pacific islands. It has naturalized in many c ...
Acacia mearnsii (Black wattle) Acacia mearnsii is a fast growing leguminous (nitrogen fixing) tree. Native to Australia, it is often used as a commercial source of tannin or a source of fire wood for local communities. It threatens ...
Acacia melanoxylon (Australian blackwood) Acacia melanoxylon is native in eastern Australia. This tree grows fast and tall, up to 45m height. It has a wide ecological tolerance, occurring over an extensive range of soils and climatic conditio ...
Acacia nilotica (Gum Arabic Tree) Acacia nilotica is a small tree 4 to 5 metres tall that was initially introduced to tropical areas for shading and forage. It forms dense stands that limit access to water for livestock, diminish the ...
Acacia retinodes (Everblooming Acacia) Water wattle (Acacia retinodes) is a small tree native to Australia. It is cultivated as an ornamental tree in warmer parts of the world. It is known to have naturalised in California where it has spr ...
Acacia saligna (Port Jackson Willow) Due it its many uses Acacia saligna, or the Port Jackson willow, has been globally distributed with up to 300 000 ha planted worldwide and was identified as one of three priority multipurpose s ...
Acanthaster planci (crown-of-thorns starfish) Coral gardens from Micronesia and Polynesia provide valuable marine resources for local communities and environments for native marine species such as marine fish. In coral ecosystems already affected ...
Acanthocereus tetragonus (triangle cactus) Acanthocereus tetragonus is native to South America and Central America and is the most popular and largest cactus of its kind, growing from 2 to 7m tall. This cactus can form impenetrable thickets th ...
Acanthogobius flavimanus (Yellowfin goby) The yellowfin goby, Acanthogobius flavimanus is native to Asia. It has been introduced to Australia and the west coast of North America through ship ballast water and hull fouling. It negativel ...
Acanthophora spicifera Acanthophora spicifera is a red algae which is found in most tropical or subtropical seas of the world. Its plastic morphology allows it to adapt to a variety of environmental conditions, and hence it ...
Acanthus mollis (bear's breech) Acanthus mollis is a dicotyledon herb that has a tall inflorescence - up to 2 m high. It is cultivated for ornamental reasons and often grows in the wild as a garden escape. A. mollis is ...
Acer tataricum subsp. ginnala (Amur maple) Acer ginnala, commonly known as Amur maple, is a decidous tree, native to Russia and northern China. It was introduced into the United States as an ornamental, due to its vibrant colours in autumn. It ...
Acer platanoides (Norway maple) Acer platanoides is a decidous maple, native to Europe. It is commonly planted as an ornamental along streets and in parks. It has escaped and invaded natural forested habitats all over North America. ...
Acnemia bifida The fungus gnat Acnemia bifida (=Mycoma bifida) has been listed as an invasive alien on the sub-Antarctic island of South Georgia. ...
Acridotheres fuscus (Jungle Myna) Acridotheres fuscus is native to India and south-east Asia and is now established in many Pacific islands. Acridotherea can be translated as “grasshopper hunter” - presumably an indication of its majo ...
Acridotheres tristis (Common Myna) The common myna (Acridotheres tristis), also called the Indian myna, is a highly commensal Passerine that lives in close association with humans. It competes with small mammals and bird for ne ...
Acromyrmex octospinosus (Leafcutter ant) Leaf cutting ants Acromyrmex octospinosus are regarded as serious pests of crops. In the wild, they are a threat to many species of native plants thaat are vulnerable to defoliation. ...
Adelges tsugae (Hemlock woolly adelgid) Adelges tsugae is a small, aphid-like insect that has become a serious pest of eastern hemlock and Carolina hemlock. The most obvious sign of infestation is the presence of white, woolly egg masses o ...
Adenanthera pavonina (red beadtree) A medium-sized tree up to 15m high, Adenanthera pavonina is native to India and Malaysia. It has been planted extensively throughout the tropics as an ornamental and has become naturalised in many cou ...
Aedes aegypti (yellow fever mosquito) The yellow fever mosquito Aedes aegypti is very common in urban and suburban areas in the tropic and subtropic regions. It is adapted to close association with humans and the female feeds almos ...
Aedes albopictus (forest day mosquito) The Asian tiger mosquito is spread via the international tire trade (due to the rainwater retained in the tires when stored outside). In order to control its spread such trading routes must be highlig ...
Aegilops triuncialis (barb goatgrass) Aegilops triuncialis (barb goatgrass) is an annual grass with a native range throughout Europe, Asia and the Mediterranean Basin. It has invaded the United States, where it is particularly inva ...
Agapanthus praecox (African-lily) Agapanthus praecox is a rhizomatous herb that is native to South Africa, along with its subspecies, A. praecox subsp. minimus, A. praecox subsp. orientalis and A. ...
Agave americana (American century plant) Agave americana is a large, rhizomatous succulent that grows in a wide range of conditions including cliffs, urban areas, woodlands, grasslands, riparian zones, beaches and sandy areas, and roc ...
Agave sisalana (sisal hemp) Agave sisalana is a member of the Agavaceae family and is native to Mexico. It is known primarily for its fibre production, and is grown commercially worldwide for the fibre industry. It is a l ...
Ageratina repens (Mistflower) Ageratina riparia is a popular ornamental plant that has been widely spread from its home region in Central America. It is naturalised in many tropical regions of the world and is invasive in some suc ...
Ageratum conyzoides (Billygoat-weed) Ageratum conyzoides is a weed distributed in many tropical and subtropical countries and is often difficult to control. It is an established weed in the Himalayas where several invasion researc ...
Agrostis capillaris (colonial bent) Agrostis capillaris is a perennial grass that inhabits various environments ranging from urban to coastal wetland, including grassland as well as near arctic regions of the world. In areas of invasion ...
Agrostis gigantea (redtop) Agrostis gigantea commonly known as redtop, is reported to be weedy or invasive in some states in the USA and provinces in Canada. Native to temperate and tropical Asia, parts of Europe and Nor ...
Ailanthus altissima (ailanthus) Ailanthus altissima is a very aggressive plant, a prolific seed producer (up to 350,000 seeds in a year), grows rapidly, and can overrun native vegetation. It also produces toxins that prevent the est ...
Akebia quinata (Chocolate Vine) Akebia quinata, also known as chocolate vine, is a twining woody vine that grows quickly and, if left unmanaged, can cover, out-compete and kill existing ground level herbs and seedlings, understorey ...
Albizia julibrissin (Mimosa) Albizia julibrissin is commonly used as an ornamental tree because of its appealing fragrance, showy flowers and low maintenance requirement. It has escaped from the urban landscape and competes with ...
Albizia lebbeck (raom tree) Albizia lebbeck probably originated in tropical Asia and was introduced for forestry or erosion control in many countries. Fast-growing and reaching 18 to 30m in height, it is now naturalised mainly i ...
Albizia saman (Rain Tree) Samanea saman is a leguminous tree which can easily reach a height of 25 metres. It has been distributed around the world, mostly in tropical climates and has become naturalised in many countries. Sam ...
Alectoris chukar (Chukar Partridge) Alectoris chukar has a wide distribution, stretching from the Aegean Sea through to Central and Eastern Asia. There does however seem to be two genetic clades within the species, those from th ...
Aleurites moluccanus (Indian walnut) Aleurites moluccana can grow up to 15 or 25m in height in adulthood. This tree is originally from south-east Asia and it has been introduced to many tropical regions. It is grown for its nuts, which a ...
Alexandrium minutum Alexandrium minutum is a small dinoflagellate that forms algal blooms in many coastal regions around the world. It was originally described from a red tide in the Alexandria harbour. Toxins produced i ...
Alitta succinea (ambergele zeeduizendpoot) The infaunal polychaete Allita succinea, also known as the pileworm, is native to the Atlantic coast and now occurs along the coasts off North, Central and South America, Europe, Africa and the Black ...
Alliaria petiolata (Garlic Mustard) It is believed that European settlers brought Alliaria petiolata to North America for cooking purposes. Alliaria petiolata may outcompete native herbaceous species and negatively impact ecosystems of ...
Alnus glutinosa (European alder) Alnus glutinosa is a member of the birch family (Betulaceae) and is native to Eurasia and the northern part of Africa. Members of the Alnus genus are commonly known as alders; A. glutinosa
Alosa pseudoharengus (kyack) Alosa pseudoharengus (alewife) is a small, fish species indigenous to the east coast of North America that causes several major effects in aquatic environments. Alewife migrate from the ocean to spawn ...
Alpinia zerumbet (shellplant) Alpinia zerumbet is a lush, coarse-textured, clumping evergreen planted for its heavy rosette of arching stems and green leaves arising from a large loose center. A. zerumbet forms dense thickets in s ...
Alternanthera philoxeroides (alligator weed) Alternanthera philoxeroides, commonly known as alligator weed, is a perennial stoloniferous herb that can be found in many parts of the world, infesting rivers, lakes, ponds and irrigation canals, as ...
Alternanthera sessilis (sessile joyweed) Alternanthera sessilis is a weed that inhabits many areas of the world. It occupies moist areas and can be found from sea level to over 2000m. Alternanthera sessilis is a pest of sugarcane, a weed of ...
Ameiurus nebulosus (Brown bullhead) Ameiurus nebulosus, the brown bullhead, is a species of catfish native to North America and introduced to a number of other countries around the world as a game fish. It is a hardy species that can to ...
Ammophila arenaria (European beachgrass) Commonly known as marram grass, Ammophila arenaria is a beach grass native to Europe, the Mediterranean, and the coasts of the Black Sea. Widely distributed to stabilise and establish sand dune ...
Ampelopsis heterophylla var. brevipedunculata Ampelopsis brevipedunculata is a deciduous, climbing vine of the grape family. It is a hardy species that can adapt to a variety of environmental conditions, growing especially well in moist soils ex ...
Anas platyrhynchos (Mallard) The mallard (Anas platyrhynchos) is the most common and widely distributed dabbling duck, having a widespread global distribution throughout the northern hemisphere. This migratory species is a ...
Angiopteris evecta (Madagascar tree fern) Angiopteris evecta is a fern native to Polynesia, Melanesia, Micronesia, Australia, and New Guinea that has established invasive populations in Hawaii, Costa Rica, and Jamaica. It is known to e ...
Annona squamosa (sugar apple) Annona squamosa is native to tropical America and perhaps the Caribbean. Annona squamosa is the most cultivated species of the genus Annona and it grows wild in virtually all tropical areas. It is nat ...
Anolis aeneus (Bronze Anole) The bronze anole, Anolis aeneus is native to the Lesser Antilles and has been introduced and established on Trinidad since the early 1800's. Despite this, the negative ecological and economic e ...
Anolis carolinensis (Green anole) The green anole, Anolis carolinensis is a moderate sized arboreal lizard native to the southeastern United States. Most likely spread through unintentional transport, alien populations have managed to ...
Anolis cristatellus (Common Puerto Rican anole, Crested anole) Anolis cristatellus or the crested anole, is native to Puerto Rico and the Virgin Islands and is best distinguished by the high crests on the middle of the back and on the base of the tail. It ...
Anolis distichus (Hispaniolan gracile anole, Bark anole) The bark anole, Anolis distichus is a small arboreal lizard which feeds on tiny insects on the bark surface of trees. Native to Great Bahama Island, it has been introduced to Little Bahama Isla ...
Anolis extremus (Barbados anole) Native to Barbados, Anolis extremus is a fairly large anole capable of competing with and / or displacing both native and other introduced anole lizards. This is best illustrated on St. Lucia w ...
Anolis leachii (Barbuda Bank tree anole, Panther Anole) The Barbuda Bank tree anole, Anolis leachii was accidently introduced to Bermuda along with the Barbados anole (
Anolis maynardi (Maynard's Anole) Little is known about the biology of Maynard's anole (Anolis maynardi). Most easily identified from its long, slender head, it has been introduced to Cayman Brac from Little Cayman, possibly th ...
Anolis porcatus (Cuban Green Anole) The Cuban green anole, Anolis porcatus is thought to have been unintentionally introduced to the Domincan Republic. There have been signs of competition with the native A. chlorocyanus. ...
Anolis richardii (Anole) A pair of Anolis richardii was intentionally released into a garden in David Simonstraat, Rainville District on the northern edge of Paramaribo in May, 1973. In January, 1974, at least ten juveniles w ...
Anolis trinitatis (Saint Vincent's bush anole, Trinidad Anole) St. Vincent's bush anole, Anolis trinitatis has been introduced and established on Trinidad since the early 1800's along with the similar and also introduced bronze anole
Anolis forresti (Watts' Anole) Watt's anole, Anolis wattsi is a moderate sized lizard native to Antigua and Barbuda. It is widespread on St. Lucia and Trinidad, where it has displaced the native St. Lucia anole A. luciae< ...
Anopheles quadrimaculatus (common malaria mosquito) Anopheles quadrimaculatus a mosquito is the chief vector of malaria in North America. This species prefers habitats with well-developed beds of submergent, floating leaf or emergent aquatic veg ...
Anoplolepis gracilipes (yellow crazy ant) Anoplolepis gracilipes (so called because of their frenetic movements) have invaded native ecosystems and caused environmental damage from Hawaii to the Seychelles and Zanzibar. On Christmas Island i ...
Anoplophora glabripennis The Asian longhorn beetle Anoplophora glabripennis is a large wood-boring beetle that is native to countries in Asia, such as Japan, Korea and China. The beetle spends most of its life within t ...
Anredera cordifolia (Madeira vine) Anredera cordifolia, commonly known as Madeira vine is a succulent climbing vine. The combination of fleshy leaves and thick aerial tubers makes this a very heavy vine. It smothers trees and other veg ...
Anser anser (Greylag Goose) Gene-flow between Anser anser and other Anatidae bird species may threaten the genetic integrity of those species and sub-species. ...
Anthonomus grandis (boll weevil) Anthonomus grandis is a brown to greyish-brown beetle native of Mexico to Central America and invasive in the United States. A. grandis feeds and develops only in cotton and closely related tropical ( ...
Antigonon leptopus (queen's jewels) Antigonon leptopus is a smothering vine that invades disturbed areas and forest edges. It produces many seeds, which are spread by water currents and animals that consume the fruit. It has become inva ...
Aphanomyces astaci (Crayfish plague) Aphanomyces astaci commonly referred to as crayfish plague is an oomycete or water mould that infects only crayfish species. It is endemic of North America and is carried by North American crayfish sp ...
Archontophoenix cunninghamiana (Bangalow Palm) Archontophoenix cunninghamiana, commonly known as the bangalow palm, the king palm and the piccabeen palm, is largely cultivated for its tall, graceful appearance. It is endemic to the south ea ...
Ardisia crenata (coral ardisia) Ardisia crenata is an ornamental, cultivated for its very decorative red fruit, but it is easily naturalised and has become highly invasive in mesic forests in several regions of the world (e.g. Masca ...
Ardisia elliptica (Shoebutton ardisia) Ardisia elliptica is a shade tolerant evergreen tree whose fast growth and attractive fruit made it a popular ornamental plant in the past. It has escaped from private and public gardens to invade nat ...
Artemia franciscana (San Francisco brine shrimp) Ascidiella aspersa (European sea squirt) is a solitary marine and estuarine tunicate that is native from Norway to the Mediterranean. It is a suspension filter-feeder and was introduced via fo ...
Ascidiella aspersa (European sea squirt) Ascidiella aspersa (European sea squirt) is a solitary marine and estuarine tunicate that is native from Norway to the Mediterranean. It is a suspension filter-feeder and was introduced via fo ...
Asparagus densiflorus (Sprenger's asparagus fern) Asparagus densiflorus, commonly known as asparagus fern, is not a true fern. It reproduces by seed. A. densiflorus is known to invade a variety of habitats, and its impacts include smothering of fores ...
Asparagus officinalis (garden asparagus) Garden asparagus (Asparagus officinalis) is described as a persistant weed of cultivated land in its introduced range. It is found growing in waste places and along roadsides. It is classified as inva ...
Asterias amurensis (Flatbottom seastar) Originally found in far north Pacific waters and areas surrounding Japan, Russia, North China, and Korea, the northern Pacific seastar (Asterias amurensis) has successfully invaded the southern coasts ...
Asystasia crispata (Ganges primrose) Asystasia gangetica is an ornamental herb native to India, Malaysia and Africa. With its ability to reproduce by vegetative propagation and form dense vegetation mats, this species can be highly invas ...
Aulacaspis yasumatsui (cycad aulacaspis scale) Aulacaspis yasumatsui (cycad aulacaspis scale (CAS)) or the Asian cycad scale, is highly damaging to cycads, which include horticulturally important and endangered plant species. The cycad scale is a ...
Axis axis (chital) Axis axis is an introduced species of deer from India. It has historically been introduced to various locations because of its desirable qualities as a game species. When herd populations becom ...
Azolla pinnata (mosquito fern) Azolla pinnata can spread rapidly, and has the ability to survive on moist soil in and around rivers, ditches, and ponds. It forms dense surface mats, which degrade water quality by reducing oxygen le ...
Bacopa monnieri (herb of grace) Bacopa monnieri is a small sprawling herb common in fresh and brackish waters. It is found growing in freshwater wetlands, wet pastures and margins of ponds on Grand Cayman where it is listed as an in ...
Bactrocera tryoni (Queensland fruit fly) The Queensland fruit fly (Bactrocera tryoni), also known as Q-fly and QFF, is common in towns and horticultural areas throughout eastern Australia. It was introduced into New Caledonia around 1 ...
Batillaria attramentaria (Japanese false cerith) Batillaria attramentaria, commonly known as the Asian hornsnail, was introduced to America from Japan at some point in the late 1920s and early 1930s. It is found in the United States in California an ...
Batrachochytrium dendrobatidis Batrachochytrium dendrobatidis is a non-hyphal parasitic chytrid fungus that has been associated with population declines in endemic amphibian species in upland montane rain forests in Australia and P ...
Begonia cucullata (clubed begonia) Begonia cucullata is a herbaceous perennial plant native to South America. The begonia genus includes nearly 900 species and almost all of the Begoniaceae family. Many species have been used to obtain ...
Astranthium integrifolium subsp. integrifolium (Daisy) The English daisy Bellis perennis is a pasture weed that can get aggressive and dominant sometimes leading to lower pasture production. It is found growing in lawns, pastures (especially wetter areas) ...
Bemisia tabaci (sweetpotato whitefly) Bemisia tabaci has been reported from all continents except Antarctica. Over 900 host plants have been recorded for B. tabaci and it reportedly transmits 111 virus species. It is believed that B. taba ...
Berberis darwinii (Darwin's berberis) Berberis darwinii exists as varying habits in New Zealand from shrubs with interlaced branches, reaching 3-4m in height and 3-6m wide in the open and at the forest edge to lianoid small trees g ...
Berberis thunbergii (Japanese barberry) Berberis thunbergii is a shrub native to Japan. When introduced it can invade a variety of habitats from damp lowlands to dry roadsides and waste places. This species forms dense stands in a variety o ...
Bidens acuticaulis var. acuticaulis (Spanish Needle) Bidens pilosa is a cosmopolitan, annual herb which originates from tropical and Central America. Its hardiness, explosive reproductive potential, and ability to thrive in almost any environment ...
Boa constrictor imperator (Central American boa) The common Boa constrictor imperator is a top nocturnal predator that kills its prey by constriction. Although it prefers small mammals such as rodents and bats, it also eats birds, amphibians ...
Boiga irregularis (Brown catsnake, Brown Tree Snake) Native island species are predisposed and vulnerable to local extinction by invaders. When the brown tree snake (Boiga irregularis) was accidentally introduced to Guam it caused the l ...
Boonea bisuturalis (two-groove odostome) Boonea bisuturalis is native to the St. Lawrence River and the northwest Atlantic coast. It primarily feeds on other molluscs and grasses. It is an extoparisitic species and feeds on internal p ...
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Invasive Status provided by Global Invasive Species Database Downloaded on 10 May 2011.