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Introduced alien species

Competes with agricultural crops

Volunteer crop species

Contamination of crop harvest

Contamination of animal products

Affects the operation of farm machinery

Injurious to livestock and wildlife

Injurious to humans

Host plant for pests

Host plant for diseases

Provides shelter for feral animals

Allergenic

Toxic

Narcotic

Invades grazing land

Low nutritional forage value

Unpalatable

Hybridizes

Allelopathic

Changes soil chemistry

Increases soil erosion

Parasitic

Damage to property and infrastructure

Degrades habitat for native plants and animals

Climbing or smothering growth habit

Decreases recreation opportunities

Fire hazard 

Impacts on waterways and water resources

Deprives people and ecosystems of  water resources

Clogs irrigation channels

Clogs drinking, irrigation and hydroelectric power water pipes.

Blocks navigation and flood control

Invades marine environments

Since authorities can use different family names, we have included family names from The Plant List, International Plant Names Index (IPNI) and US Department of Agriculture

We have given a priority to "eae" endings for consistency, and list alternative names as aka for the common families:

Apiaceae aka Umbelliferae
Asteraceae aka Compositae
Brassicaceae aka Cruciferae
Fabaceae aka Leguminosae
Lamiaceae aka Labiatae
Poaceae aka Gramineae

Priority given to the most commonly used family name

Where species have been reclassified, or families re-assigned, we include previous family names as aka because many sources continue to use the names

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If you intend to use any photographs it is your responsibility to visit the original source and to make your own determination as to licencing arrangements