Pacific Island Ecosystems at Risk project (PIER)


Plant threats to Pacific ecosystems

Prospective Invasive Species
for Pacific Islands

A product of the Pacific Island Ecosystems at Risk project (PIER)


Following are some plant species that:

These species are prospects for possible addition to PIER.  If you have comments on them, pro or con, (or additional species to nominate) please let us know. If you can contribute information on any you think should be included, it would  be greatly appreciated.


Species Comments
Acacia dunnii (Fabaceae) "Widely cultivated with occasional escapees becoming established in the Northern Territory [Australia]" (Orchard & Wilson, 2001; p. 152).
Alpinia vittata (Zingiberaceae)  
Alpinia zerumbet (Zingiberaceae) Reported as possibly an invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Alternanthera ficoidea (Amaranthaceae) A minor weed in northern Queensland (Barbara Waterhouse, pers. com.)
Aptenia cordifolia (Aizoaceae) A minor weed in New Zealand per Melanie Newfield, pers. com. Reported as possibly an invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Asparagus officinalis (Asparagaceae) Reported as possibly an invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Asparagus scandens (Asparagaceae) Reported as an invasive plant in northern New Zealand (per Melanie Newfield, pers. com.).
Avena sativa (Poaceae) Reported as possibly an invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Begonia rex (Begoniaceae) Invasive in La Réunion per Christophe Lavergne, pers. com. Most plants grown under this name are Begonia rex-cultorum hybrids (Staples & Herbst, 2005; p. 177).
Berchemia zeyheri (Rhamnaceae) This species has very valuable wood and may be introduced for this purpose (it was recently proposed for planting in Hawai‘i). Given the possibility of bird and animal dispersal, it should be thoroughly evaluated before introduction.
Blainvillea gayana (Asteraceae) Recently discovered in the Mackay and Proserpine area of Queensland, Australia (Barbara Waterhouse, pers. com.).
Bougainvillea spectabilis (Nyctaginaceae)  
Bulbostylis barbata (Cyperaceae) Reported to be an invasive species in southeast Asia per Barbara Waterhouse, pers. com.
Caesalpinia crista (Fabaceae)  
Carica papaya (Caricaceae) Commonly naturalizing in disturbed areas (especially burned areas) on most Pacific Islands but usually not persisting. An invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Cassia fistula (Fabaceae)  
Ceratophyllum llerenae (Ceratophyllaceae) Probably not native to the Galápagos Islands, probably introduced per Charles Darwin Research Institute.
Ceratopteris pteridoides (Pteridaceae) Reported as possibly an invasive plant in southeast Asia (per Barbara Waterhouse, pers. com.).
Chasmanthe aethiopica (Iridaceae)  
Chasmanthe floribunda (Iridaceae)  
Chionanthus intermedius (Oleaceae) Reported as possibly an invasive plant in the Hawaiian Islands per Meyer, 2000.
Citrus medica (Rutaceae)  
Citrus nobilis (Rutaceae)  
Cnidoscolus urens (Euphorbiaceae)  
Cordia sebestena (Boraginaceae) Reported as possibly an invasive plant in the Hawaiian Islands per Staples et al., 2000.
Coreopsis basalis (Asteraceae) Reported invasive in Japan (The Research Institute for Bioresources. Okayama University. Laboratory of Wild Plant Science. Naturalized plants from foreign country into Japan).
Crescentia cujete (Bignoniaceae)  
Cupressus lusitanica (Cupressaceae) Reported to be a potentially invasive species in Australia per Csurhes and Edwards, 1998.
Cynodon nlemfuensis (Poaceae)  
Dioscorea sansibarensis (Dioscoreaceae) Reported to be an invasive species in Singapore per Rejmánek, 1996.
Dipogon lignosus (Fabaceae) Reported to be an invasive species in Australia and New Zealand per Owen, 1997.
Dracaena fragrans (Asparagaceae) Reported to be an invasive species in Australia per Barbara Waterhouse (pers. com.).
Durio zibethinus (Malvaceae) Reported to be a potential invader in the Solomon Islands (Wairiu and Wagatora, 2002; pp. 15-17).
Echium candicans (Boraginaceae) Reported as an invasive plant in California per Nancy Vander Velde, pers. com.
Etlingera elatior (Zingiberaceae) Escaped from cultivation in Hawai‘i (Kaua‘i) per David Lorence, pers. com.
Eulophia graminea (Orchidaceae) Reported as an invasive species in Australia per Barbara Waterhouse, pers. com., and Smith, 2002.
Euphorbia pulcherrima (Euphorbiaceae)  
Gynerium sagittatum (Poaceae)  
Hedychium coccineum (Zingiberaceae) Reported as an invasive species in Jamaica.
Hibiscus rosa-sinensis (Malvaceae)  
Hibiscus schizopetalus (Malvaceae) "Hybridizes readily with Hibiscus rosa-sinensis" (Smith, 1981; p. 420).
Hypericum japonicum (Hypericaceae)  
Inga insignis (Fabaceae)  
Ipomoea lobata (Convolvulaceae) Reported invasive in Tanzania (Rejmánek, 1996).
Ixophorus unisetus (Poaceae)  
Kalanchoe blossfeldiana (Crassulaceae) Reported as possibly an invasive plant in the Galápagos Islands per Charles Darwin Research Station.
Kalanchoe eriophylla (Crassulaceae)  
Kalanchoe gastonis-bonnieri (Crassulaceae) Other Kalanchoes are invasive.
Kalanchoe grandiflora (Crassulaceae)  
Lepidium densiflorum (Brassicaceae)  
Leptochloa virgata (Poaceae)  
Mentha arvensis (Lamiaceae) Reported invasive in southeast Asia (Barbara Waterhouse, pers. com.).
Mollugo verticillata (Molluginaceae)  
Morinda citrifolia (Rubiaceae)  
Nasturtium officinale (Brassicaceae) Naturalized and more or less invasive in La Réunion per Christophe Lavergne, pers. com.
Oryza rufipogon (Poaceae) Reported to be an invasive plant in southeast Asia (Barbara Waterhouse, pers. com.).
Panicum trichoides (Poaceae)  
Panicum virgatum (Poaceae)  
Peltophorum pterocarpum (Fabaceae) Planted as an ornamental tree. Some naturalizing reported in Hawai‘i (Starr, pers. com.).
Phyllanthus emblica (Phyllanthaceae) A potentially invasive species in Australia (Csurhes & Edwards, 1998; p. 123).
Polygala myrtifolia (Polygalaceae) Reported to be an invasive species in New Zealand (Owen, 1997; p. 86).
Pseuderanthemum bicolor (Acanthaceae) Reported as possibly an invasive plant in Fiji (Meyer, 2000; p. 92).
Rhamnus alaternus (Rhamnaceae) Reported as an invasive plant in New Zealand (Owen, 1996).
Schoenoplectus juncoides (Cyperaceae) Reported as possibly an invasive plant in southeast Asia (Barbara Waterhouse, pers. com.).
Sinapis arvensis (Brassicaceae)  
Solanum sisymbriifolium (Solanaceae) Reported invasive in Spain. A noxious weed in South Africa (Henderson, 1995; p. 177).
Tamarindus indica (Fabaceae)  
Thalia geniculata (Marantaceae)  
Thaumatococcus daniellii (Marantaceae) A potential invasive species in Australia (Csurhes & Edwards, 1998; p. 131).
Triplaris americana (Polygonaceae) A declared noxious weed in South Africa.
Typha angustifolia (Typhaceae)  
Urochloa fusca (Poaceae)  
Wisteria sinensis (Fabaceae)  

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This page was last updated on 11 Mar 2017.