African Boxthorn - Lycium ferocissimum

Introduced as a garden or hedge plant in the mid 1800s. Now a serious weed, particularly on neglected land in arid temperate Australia. May produce thickets that become refuges for feral animals.... more

African Feather Grass - Pennisetum macrourum

Possibly introduced to Australia in hay brought back with horses after the Boer War. Spring and summer growing grass that is drought resistant, has low palatability, harbours rabbits, is a fire hazard and restricts access to watercourses. O... more

African Lovegrass - Eragrostis curvula

A variable species complex. Valued for soil conservation and fodder or regarded as a serious weed. Introduced for soil stabilisation. Common on sandy soils; capable of resisting drought and heavy grazing. Successfully competes with low grow... more

African daisy - Senecio pterophorus

Introduced to SA at Port Lincoln in ballast, in about 1930. Now well established in the Eyre Peninsula, the Adelaide Hills and south-eastern SA and present and increasing in Victoria and NSW. Cultivated as an ornamental. Readily invades are... more

African olive - Olea europaea subspecies cuspidata

A locally common weed of roadsides, neglected land and stream banks. African Olive produces fruit that are usually smaller and less fleshy than those of plants cultivated for edible olives and olive oil.... more

African weed-orchid - Disa bracteata

The species is self-pollinating. It forms dense colonies and replaces native ground flora where it occurs in Western Australia, South Australia and Victoria. First herbarium specimens were collected in Western Australia in 1944, in South Au... more

Alisma - Alisma lanceolatum

Thrives in shallow, slow-moving or stationary, nutrient rich water. A serious weed of rice in New South Wales.... more

Alkali Sida - Malvella leprosa

Above ground growth dies in autumn and new shoots grow from the root system in spring. Infests annual crops and pastures, neglected land, and ditch banks in irrigation areas. Not readily grazed. A crop weed in California, especially on sali... more

Alligator Weed - Alternanthera philoxeroides

Amongst the worst aquatic weed threats in Australia. Adapted to growing on damp land, occasionally flooded land, in shallow water (rooted in the substrate), attached to the bank (in deep water) or free floating. Will survive for a few days ... more

Annual Ragweed - Ambrosia artemisiifolia

Weed of roadsides, wastelands and occasionally cultivation. Major cause of allergy with pollen causing flu-like symptoms; contact with the plant can also cause skin allergies. The stem-galling moth, Epiblema strenuana, introduced for... more