Acaena novae-zelandiae (Bidibid)
Species: Acaena novae-zelandiae
Common name: bidibid. biddy-biddy, biddi-biddi, biddi-bid and a number of other variations. Maori name of piripiri.
Acaena novae-zelandiae is native to New Zealand and Australia. It can also be found elsewhere in the world as an introduced species and is considered a noxious weed in some areas, such as Hawaii and California. One plant can cover up to 4-5 square meters under ideal condition. Plants have a burr which is formed after flowering and is beset with barbed spines which cling to the clothing of passers-by and to animals. It’s a serious problem in the wool of sheep.
A developing burr
A mature biddy-bid burr
A cluster of bidibid burrs, all the leaves have died.
Acaena novae-zelandiae barbs
Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/