Acaena novae-zelandiae (Bidi-bidi or Biddy-biddy or Bidgee-widgee) is an ornamental plant

Ornamental plant

Ornamental plants are plants that are grown for decorative purposes in gardens and landscape design projects, as house plants, for cut flowers and specimen display...

 native to New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

 and Australia. It can also be found elsewhere as an introduced species

Introduced species

An introduced species — or neozoon, alien, exotic, non-indigenous, or non-native species, or simply an introduction, is a species living outside its indigenous or native distributional range, and has arrived in an ecosystem or plant community by human activity, either deliberate or accidental...

, and is considered a noxious weed in some areas, such as Hawaii and California.

Characteristics

Bidgee-Widgee is a prostrate herb. One plant can cover up to 4-5 square meters under ideal condition. Plants have a burr which is formed after flowering.